diff --git a/get-prebuilt.py b/get-prebuilt.py
index 770ccf0..7dd5c23 100755
--- a/get-prebuilt.py
+++ b/get-prebuilt.py
@@ -10,7 +10,7 @@
 
 if len(sys.argv) < 2:
 	print('usage: ./get-prebuilt.py image[:tag]')
-	exit(-1)
+	sys.exit(-1)
 
 image, tag, fname, label = parse_image_arg(sys.argv[1], False)
 
@@ -29,11 +29,11 @@
 
 except urllib.error.HTTPError as err:
 	print('%s[!]%s Failed to authorization token: %s' % (Fore.RED, Fore.RESET, err))
-	exit(-1)
+	sys.exit(-1)
 
 except KeyError as err:
 	print('%s[!]%s Failed to authorization token: %s' % (Fore.RED, Fore.RESET, err))
-	exit(-1)
+	sys.exit(-1)
 
 # get the image manifest
 
@@ -51,11 +51,11 @@
 
 		if len(manifest['fsLayers']) == 0:
 			print('%s[!]%s Manifest for image %s%s%s has no layers.' % (Fore.RED, Fore.RESET, Fore.BLUE, image, Fore.RESET))
-			exit(-1)
+			sys.exit(-1)
 
 except urllib.error.HTTPError as err:
 	print('%s[!]%s Failed to fetch manifest info for %s%s%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, image, Fore.RESET, err))
-	exit(-1)
+	sys.exit(-1)
 
 # download the layers
 
@@ -84,11 +84,11 @@
 	except urllib.error.HTTPError as err:
 		clear_progress()
 		print('%s[!]%s Failed to download layer %s%s%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, layer['blobSum'], Fore.RESET, err))
-		exit(-1)
+		sys.exit(-1)
 
 	except OSError as err:
 		clear_progress()
 		print('%s[!]%s Failed to open file %s%s%s for writing: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, fname, Fore.RESET, err))
-		exit(-1)
+		sys.exit(-1)
 
 print('%s[*]%s Rootfs archive for %s%s%s:%s%s%s saved to %s%s%s.' % (Fore.GREEN, Fore.RESET, Fore.YELLOW, image, Fore.RESET, Fore.YELLOW, tag, Fore.RESET, Fore.GREEN, fname, Fore.RESET))
diff --git a/get-source.py b/get-source.py
index e390adf..083f7a1 100755
--- a/get-source.py
+++ b/get-source.py
@@ -8,7 +8,7 @@
 
 if len(sys.argv) < 2:
 	print('usage: ./get-source.py image[:tag]')
-	exit(-1)
+	sys.exit(-1)
 
 image, tag, fname, label = parse_image_arg(sys.argv[1], False)
 
@@ -104,12 +104,12 @@
 
 		if not dfurl:
 			print('%s[!]%s Failed to find tag %s%s%s for image %s%s%s.' % (Fore.RED, Fore.RESET, Fore.BLUE, tag, Fore.RESET, Fore.BLUE, image, Fore.RESET))
-			exit(-1)
+			sys.exit(-1)
 
 except urllib.error.HTTPError as err:
 	print('%s[!]%s Failed to fetch official-images info for %s%s%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, image, Fore.RESET, err))
 	print('%s[!]%s If this is not an official image, try getting it with %sget-prebuilt.py %s%s.' % (Fore.RED, Fore.RESET, Fore.GREEN, sys.argv[1].strip(), Fore.RESET))
-	exit(-1)
+	sys.exit(-1)
 
 # process Dockerfile
 
@@ -134,11 +134,11 @@
 
 		if not tgurl:
 			print('%s[!]%s Failed to find a suitable rootfs specification in Dockerfile.' % (Fore.RED, Fore.RESET))
-			exit(-1)
+			sys.exit(-1)
 
 except urllib.error.HTTPError as err:
 	print('%s[!]%s Failed to fetch Dockerfile from %s%s%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, dfurl, Fore.RESET, err))
-	exit(-1)
+	sys.exit(-1)
 
 # download rootfs archive
 
@@ -151,11 +151,11 @@
 except urllib.error.HTTPError as err:
 	clear_progress()
 	print('%s[!]%s Failed to download archive from %s%s%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, tgurl, Fore.RESET, err))
-	exit(-1)
+	sys.exit(-1)
 
 except OSError as err:
 	clear_progress()
 	print('%s[!]%s Failed to open file %s%s%s for writing: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, fname, Fore.RESET, err))
-	exit(-1)
+	sys.exit(-1)
 
 print('%s[*]%s Rootfs archive for %s%s%s:%s%s%s saved to %s%s%s.' % (Fore.GREEN, Fore.RESET, Fore.YELLOW, image, Fore.RESET, Fore.YELLOW, tag, Fore.RESET, Fore.GREEN, fname, Fore.RESET))
diff --git a/install.py b/install.py
index 39b4b86..10d290a 100755
--- a/install.py
+++ b/install.py
@@ -35,7 +35,7 @@
 if not imgarg:
 	print('usage: ./install.py [--no-hooks] image[:tag] | tarball | squashfs')
 	print('\noptions:\n  --no-hooks    Omits running the hook scripts.')
-	exit(-1)
+	sys.exit(-1)
 
 image, tag, fname, label = parse_image_arg(imgarg, True)
 
@@ -60,7 +60,7 @@
 
 	if not os.path.isfile(out):
 		print('%s[!]%s Failed to get home directory of default user in WSL: Output file %s%s%s not present.' % (Fore.RED, Fore.RESET, Fore.BLUE, out, Fore.RESET))
-		exit(-1)
+		sys.exit(-1)
 
 	with open(out) as f:
 		homedir  = f.readline().strip()
@@ -68,7 +68,7 @@
 
 		if len(homedir) == 0 or not os.path.isdir(homedirw):
 			print('%s[!]%s Failed to get home directory of default user in WSL: Returned path %s%s%s is not valid.' % (Fore.RED, Fore.RESET, Fore.BLUE, homedirw, Fore.RESET))
-			exit(-1)
+			sys.exit(-1)
 
 		user   = f.readline().strip()
 		isroot = user == 'root'
@@ -79,7 +79,7 @@
 
 except subprocess.CalledProcessError as err:
 	print('%s[!]%s Failed to get home directory of default user in WSL: %s' % (Fore.RED, Fore.RESET, err))
-	exit(-1)
+	sys.exit(-1)
 
 # check squashfs prerequisites
 
@@ -87,7 +87,7 @@
 
 if (fext == '.sfs' or fext == '.squashfs') and not havesquashfs:
 	print('%s[!]%s Module %sPySquashfsImage%s is not available. Install it with %spip3 install PySquashfsImage%s for SquashFS support.' % (Fore.RED, Fore.RESET, Fore.GREEN, Fore.RESET, Fore.GREEN, Fore.RESET))
-	exit(-1)
+	sys.exit(-1)
 
 # get /etc/{passwd,shadow,group,gshadow} entries
 
@@ -108,7 +108,7 @@
 
 	except OSError as err:
 		print('%s[!]%s Failed to open file %s/etc/passwd%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, Fore.RESET, err))
-		exit(-1)
+		sys.exit(-1)
 
 try:
 	with open(os.path.join(basedir, 'rootfs', 'etc', 'shadow'), newline='\n') as f:
@@ -120,7 +120,7 @@
 
 except OSError as err:
 	print('%s[!]%s Failed to open file %s/etc/shadow%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, Fore.RESET, err))
-	exit(-1)
+	sys.exit(-1)
 
 if not isroot:
 	try:
@@ -131,7 +131,7 @@
 
 	except OSError as err:
 		print('%s[!]%s Failed to open file %s/etc/group%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, Fore.RESET, err))
-		exit(-1)
+		sys.exit(-1)
 
 	try:
 		with open(os.path.join(basedir, 'rootfs', 'etc', 'gshadow'), newline='\n') as f:
@@ -141,7 +141,7 @@
 
 	except OSError as err:
 		print('%s[!]%s Failed to open file %s/etc/gshadow%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, Fore.RESET, err))
-		exit(-1)
+		sys.exit(-1)
 
 if etcshadowroot:
 	parts = etcshadowroot.split(':')
@@ -169,7 +169,7 @@ def retry_rw(operation, name, exc):
 
 	if os.path.exists(os.path.join(homedirw, 'rootfs-temp')):
 		print('%s[*]%s Failed to remove leftover %srootfs-temp%s.' % (Fore.RED, Fore.RESET, Fore.BLUE, Fore.RESET))
-		exit(-1)
+		sys.exit(-1)
 
 # extract archive
 
@@ -258,7 +258,7 @@ def retry_rw(operation, name, exc):
 			if file is None:
 				clear_progress()
 				print('%s[!]%s Failed to extract archive: unable to determine archive type.' % (Fore.RED, Fore.RESET))
-				exit(-1)
+				sys.exit(-1)
 
 			while file is not None:
 				try:
@@ -331,7 +331,7 @@ def retry_rw(operation, name, exc):
 	except Exception as err:
 		clear_progress()
 		print('%s[!]%s Failed to extract archive: %s' % (Fore.RED, Fore.RESET, err))
-		exit(-1)
+		sys.exit(-1)
 
 	finally:
 		clear_progress()
@@ -354,7 +354,7 @@ def retry_rw(operation, name, exc):
 
 except subprocess.CalledProcessError as err:
 	print('%s[!]%s Failed to backup current %srootfs%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, Fore.RESET, err))
-	exit(-1)
+	sys.exit(-1)
 
 print('%s[*]%s Switching to new %srootfs%s...' % (Fore.GREEN, Fore.RESET, Fore.BLUE, Fore.RESET))
 
@@ -374,7 +374,7 @@ def retry_rw(operation, name, exc):
 		print('%s[!]%s Failed to roll back to old %srootfs%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, Fore.RESET, err))
 		print('%s[!]%s You are now the proud owner of one broken Linux subsystem! To fix it, run %slxrun /uninstall%s and %slxrun /install%s from the command prompt.' % (Fore.RED, Fore.RESET, Fore.GREEN, Fore.RESET, Fore.GREEN, Fore.RESET))
 
-	exit(-1)
+	sys.exit(-1)
 
 # save label
 
@@ -460,7 +460,7 @@ def retry_rw(operation, name, exc):
 
 	except subprocess.CalledProcessError as err:
 		print('%s[!]%s Failed to switch default user in WSL: %s' % (Fore.RED, Fore.RESET, err))
-		exit(-1)
+		sys.exit(-1)
 
 	try:
 		subprocess.check_call(['cmd', '/C', lxpath + '\\bash.exe', '-c',
@@ -469,7 +469,7 @@ def retry_rw(operation, name, exc):
 
 		if not os.path.isfile(out):
 			print('%s[!]%s Failed to get home directory of default user in WSL: Output file %s%s%s not present.' % (Fore.RED, Fore.RESET, Fore.BLUE, out, Fore.RESET))
-			exit(-1)
+			sys.exit(-1)
 
 		with open(out) as f:
 			homedir = f.readline().strip()
@@ -477,19 +477,19 @@ def retry_rw(operation, name, exc):
 
 			if len(homedir) == 0 or not os.path.isdir(homedirw):
 				print('%s[!]%s Failed to get home directory of default user in WSL: Returned path %s%s%s is not valid.' % (Fore.RED, Fore.RESET, Fore.BLUE, homedirw, Fore.RESET))
-				exit(-1)
+				sys.exit(-1)
 
 			user2 = f.readline().strip()
 
 			if user2 != 'root':
 				print('%s[!]%s Failed to switch default user to %sroot%s.' % (Fore.RED, Fore.RESET, Fore.YELLOW, Fore.RESET))
-				exit(-1)
+				sys.exit(-1)
 
 		os.unlink(out)
 
 	except subprocess.CalledProcessError as err:
 		print('%s[!]%s Failed to get home directory of default user in WSL: %s' % (Fore.RED, Fore.RESET, err))
-		exit(-1)
+		sys.exit(-1)
 
 	# since we switched to root, switch back to regular user on exit
 
@@ -501,7 +501,7 @@ def switch_user_back(user):
 
 		except subprocess.CalledProcessError as err:
 			print('%s[!]%s Failed to switch default user in WSL: %s' % (Fore.RED, Fore.RESET, err))
-			exit(-1)
+			sys.exit(-1)
 
 	atexit.register(switch_user_back, user)
 
diff --git a/switch.py b/switch.py
index 6f6e780..8a39a5c 100755
--- a/switch.py
+++ b/switch.py
@@ -51,7 +51,7 @@
 			else:
 				print('You do not seem to have the default distribution installed anymore.\nTo reinstall it, run %slxrun /uninstall%s and %slxrun /install%s from the command prompt.' % (Fore.GREEN, Fore.RESET, Fore.GREEN, Fore.RESET))
 
-	exit(-1)
+	sys.exit(-1)
 
 image, tag, fname, label = parse_image_arg(sys.argv[1], False)
 
@@ -71,7 +71,7 @@
 	if label == clabel:
 		print('%s[!]%s No %s/.switch_label%s found, and the target rootfs is %subuntu%s:%strusty%s. Cannot continue.' % (Fore.RED, Fore.RESET, Fore.BLUE, Fore.RESET, Fore.YELLOW, Fore.RESET, Fore.YELLOW, Fore.RESET))
 		print('%s[!]%s To fix this, run %secho some_tag > /.switch_label%s (replacing %ssome_tag%s with something like %sdebian_sid%s) from the current Bash terminal.' % (Fore.RED, Fore.RESET, Fore.GREEN, Fore.RESET, Fore.GREEN, Fore.RESET, Fore.GREEN, Fore.RESET))
-		exit(-1)
+		sys.exit(-1)
 	else:
 		print('%s[!]%s No %s/.switch_label%s found, assuming current rootfs is %subuntu%s:%strusty%s.' % (Fore.RED, Fore.RESET, Fore.BLUE, Fore.RESET, Fore.YELLOW, Fore.RESET, Fore.YELLOW, Fore.RESET))
 
@@ -79,11 +79,11 @@
 
 if clabel == label:
 	print('%s[!]%s The %s%s%s:%s%s%s rootfs is the current installation.' % (Fore.YELLOW, Fore.RESET, Fore.YELLOW, image, Fore.RESET, Fore.YELLOW, tag, Fore.RESET))
-	exit(-1)
+	sys.exit(-1)
 
 if not os.path.isdir(os.path.join(basedir, 'rootfs_' + label)):
 	print('%s[!]%s The %s%s%s:%s%s%s rootfs is not installed.' % (Fore.RED, Fore.RESET, Fore.YELLOW, image, Fore.RESET, Fore.YELLOW, tag, Fore.RESET))
-	exit(-1)
+	sys.exit(-1)
 
 # do the switch
 
@@ -94,7 +94,7 @@
 
 except subprocess.CalledProcessError as err:
 	print('%s[!]%s Failed to backup current %srootfs%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, Fore.RESET, err))
-	exit(-1)
+	sys.exit(-1)
 
 print('%s[*]%s Moving desired %srootfs_%s%s to %srootfs%s...' % (Fore.GREEN, Fore.RESET, Fore.BLUE, label, Fore.RESET, Fore.BLUE, Fore.RESET))
 
@@ -112,4 +112,4 @@
 		print('%s[!]%s Failed to roll back to old %srootfs%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, Fore.RESET, err))
 		print('%s[!]%s You are now the proud owner of one broken Linux subsystem! To fix it, run %slxrun /uninstall%s and %slxrun /install%s from the command prompt.' % (Fore.RED, Fore.RESET, Fore.GREEN, Fore.RESET, Fore.GREEN, Fore.RESET))
 
-	exit(-1)
+	sys.exit(-1)
diff --git a/utils.py b/utils.py
index d8b0797..5f8022a 100755
--- a/utils.py
+++ b/utils.py
@@ -80,7 +80,7 @@ def parse_image_arg(argv, can_be_file = False):
 				fname = names[0]
 			else:
 				print('%s[!]%s No files found matching %s%s%s.' % (Fore.RED, Fore.RESET, Fore.BLUE, fname, Fore.RESET))
-				exit(-1)
+				sys.exit(-1)
 
 		else:
 			fname = 'rootfs_%s_%s' % (image.replace('/', '_'), tag)
@@ -95,7 +95,7 @@ def parse_image_arg(argv, can_be_file = False):
 
 		if not os.path.isfile(fname):
 			print('%s[!]%s %s%s%s is not an existing file.' % (Fore.RED, Fore.RESET, Fore.BLUE, fname, Fore.RESET))
-			exit(-1)
+			sys.exit(-1)
 
 		idx = -1
 
@@ -134,14 +134,14 @@ def probe_wsl(silent = False):
 			return None, None
 
 		print('%s[!]%s The Linux subsystem is not installed. Please go through the standard installation procedure first.' % (Fore.RED, Fore.RESET))
-		exit(-1)
+		sys.exit(-1)
 
 	if os.path.exists(os.path.join(basedir, 'temp')):
 		if silent:
 			return None, None
 
 		print('%s[!]%s The Linux subsystem is currently running. Please kill all instances before continuing.' % (Fore.RED, Fore.RESET))
-		exit(-1)
+		sys.exit(-1)
 
 	lxpath  = ''
 	lxpaths = [os.path.join(os.getenv('SystemRoot'), 'sysnative'), os.path.join(os.getenv('SystemRoot'), 'System32')]
@@ -153,7 +153,7 @@ def probe_wsl(silent = False):
 
 	if not lxpath and not silent:
 		print('%s[!]%s Unable to find %slxrun.exe%s in the expected locations.' % (Fore.RED, Fore.RESET, Fore.BLUE, Fore.RESET))
-		exit(-1)
+		sys.exit(-1)
 
 	return basedir, lxpath