diff --git a/.gitignore b/.gitignore
index b03e902..c09ba98 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
 *.pyc
 poetry.csv
+
+# macOS
+.DS_Store
diff --git a/scripts/merge.py b/scripts/merge.py
index 3c053a4..49b94da 100644
--- a/scripts/merge.py
+++ b/scripts/merge.py
@@ -6,7 +6,7 @@
 def merge(output):
     with open(output, 'w', encoding='utf-8') as o:
         for file in os.listdir():
-            if file.endswith('.csv'):
+            if file.endswith('.csv') and file != output:
                 with open(file, encoding='utf-8') as i:
                     i.readline()    # the first row is the header, skipping
                     for line in i: