diff --git a/install/mac b/install/mac
index a00dea47..d096c069 100755
--- a/install/mac
+++ b/install/mac
@@ -1,11 +1,7 @@
 #!/bin/sh
 
-app_exists() {
-    if [ -e /Applications/"$1".app ] || [ -e ~/Applications/"$1".app ]; then
-        return 0
-    else
-        return 1
-    fi
+function app_exists {
+    [ -e /Applications/"$1".app ] || [ -e ~/Applications/"$1".app ]
 }
 
 source ~/.dotfiles/zsh/functions
@@ -55,4 +51,5 @@ else
     #app_exists "Sparrow" && brew cask install sparrow
 fi
 
-exit 0
+# Clean up
+unset .f app_exists