diff --git a/oh-my-zsh.sh b/oh-my-zsh.sh
index b4e95e0ff..e7a9254af 100644
--- a/oh-my-zsh.sh
+++ b/oh-my-zsh.sh
@@ -64,7 +64,7 @@ if [[ ! -w "$ZSH_CACHE_DIR" ]]; then
 fi
 
 # Create cache and completions dir and add to $fpath
-mkdir -p "$ZSH_CACHE_DIR/completions"
+[[ -d "$ZSH_CACHE_DIR/completions" ]] || mkdir -p "$ZSH_CACHE_DIR/completions"
 (( ${fpath[(Ie)$ZSH_CACHE_DIR/completions]} )) || fpath=("$ZSH_CACHE_DIR/completions" $fpath)
 
 # Check for updates on initial load...