diff --git a/scripts/git-prompt-install.sh b/scripts/git-prompt-install.sh
index ba43aa6..076a556 100755
--- a/scripts/git-prompt-install.sh
+++ b/scripts/git-prompt-install.sh
@@ -5,4 +5,7 @@ set -u
 
 readonly REPO="https://github.com/magicmonty/bash-git-prompt.git"
 
-git clone "$REPO" "$GIT_PROMPT_PATH" --depth=1
+if [[ ! -d "$GIT_PROMPT_PATH" ]]; then
+  git clone "$REPO" "$GIT_PROMPT_PATH" --depth=1
+fi
+