diff --git a/.zshrc b/.zshrc
index 44973bf..e3e40ce 100644
--- a/.zshrc
+++ b/.zshrc
@@ -60,7 +60,7 @@ find_up () {
 }
 
 command-exists () {
-  return [[ -n $commands[$1] ]];
+  return $(command -v $1 >/dev/null);
 }
 
 #---------------------------------- Tab completion ----------------------------