diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 8c67d4b..523e702 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -35,5 +35,17 @@ jobs:
         DEFANG_GH_ACTION_TEST_MESSAGE: ${{ secrets.MESSAGE }}
         DEFANG_INTERNAL_TEST: dfng-test
 
+    - name: Deploy-Empty-Params
+      uses: ./
+      continue-on-error: true # Ignore dry run error
+      with:
+        cli-version: v0.5.40
+        config-env-vars: ""
+        cwd: "./test"
+        compose-files: ""
+        behavior: ""
+      env:
+        DEFANG_INTERNAL_TEST: dfng-test
+
     - name: Teardown
       run: defang config rm DEFANG_GH_ACTION_TEST_MESSAGE
diff --git a/action.yaml b/action.yaml
index bb013d4..30465e7 100644
--- a/action.yaml
+++ b/action.yaml
@@ -57,7 +57,7 @@ runs:
             params+=("-f")
             params+=("$filename")
         done
-        if [[ -n ${{ inputs['behavior'] }} ]]; then
+        if [[ -n "${{ inputs['behavior'] }}" ]]; then
           params+=("--behavior=${{ inputs['behavior'] }}")
         fi