diff --git a/bin/down b/bin/down
index 19a04b2..73702bf 100755
--- a/bin/down
+++ b/bin/down
@@ -1,3 +1,8 @@
 #!/bin/bash
 basedir=$(dirname "$0")/..
-mutagen-compose -f "$basedir"/docker-compose.yml down
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+    IP_ADDR=$(ifconfig -l | xargs -n1 ipconfig getifaddr)
+elif [[ "$OSTYPE" == "darwin"* ]]; then
+    IP_ADDR=$(ip route get 1 | awk '{print $NF;exit}')
+fi
+PRIVATE_NETWORK_IP=${ADDR} mutagen-compose -f "$basedir"/docker-compose.yml down
diff --git a/bin/up b/bin/up
index 779166a..32a330c 100755
--- a/bin/up
+++ b/bin/up
@@ -8,4 +8,10 @@ mutagen daemon start
 echo -e ${prefix}The mutagen daemon will stay running until you stop it manually with \`mutagen daemon stop\`.$suffix
 
 echo -e ${prefix}Running mutagen-compose...$suffix
-PRIVATE_NETWORK_IP=$(ifconfig -l | xargs -n1 ipconfig getifaddr) mutagen-compose -f "$basedir"/docker-compose.yml up --build --detach
+
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+    IP_ADDR=$(ifconfig -l | xargs -n1 ipconfig getifaddr)
+elif [[ "$OSTYPE" == "darwin"* ]]; then
+    IP_ADDR=$(ip route get 1 | awk '{print $NF;exit}')
+fi
+PRIVATE_NETWORK_IP=${ADDR} mutagen-compose -f "$basedir"/docker-compose.yml up --build --detach