diff --git a/oh-my-zsh.sh b/oh-my-zsh.sh
index 4a5b175d5..689a79fef 100644
--- a/oh-my-zsh.sh
+++ b/oh-my-zsh.sh
@@ -56,6 +56,7 @@ done
 for config_file ($ZSH_CUSTOM/*.zsh(N)); do
   source $config_file
 done
+unset config_file
 
 # Load the theme
 if [ "$ZSH_THEME" = "random" ]