diff --git a/action.yml b/action.yml
index 2631789..6dd5d73 100644
--- a/action.yml
+++ b/action.yml
@@ -259,7 +259,7 @@ runs:
         mkdir -p $HOME/.cache
 
         NDK_PATH="/usr/local/lib/android/sdk/ndk/${{ inputs.android-ndk-version }}"
-        if [ ${{ inputs.android-ndk-version }} = "" ]; then
+        if [ "${{ inputs.android-ndk-version }}" = "" ]; then
           NDK_PATH="$ANDROID_NDK_LATEST_HOME"
         fi