diff --git a/gitprompt.sh b/gitprompt.sh
index f999920..f12f31f 100755
--- a/gitprompt.sh
+++ b/gitprompt.sh
@@ -267,4 +267,4 @@ else
 fi
 
 git_prompt_dir
-source $__GIT_PROMPT_DIR/git-prompt-help.sh
+source "$__GIT_PROMPT_DIR/git-prompt-help.sh"