diff --git a/.github/workflows/_deploy_lambda.yml b/.github/workflows/_deploy_lambda.yml
index 11be11a3..bc83c0af 100644
--- a/.github/workflows/_deploy_lambda.yml
+++ b/.github/workflows/_deploy_lambda.yml
@@ -88,7 +88,9 @@ jobs:
             -var="lambda_name=${{ inputs.lambda_name }}" \
             -var="ecr_repo_url=${{ steps.repo.outputs.ecr_repo_url }}" \
             -var="image_digest=${{ inputs.image_digest }}" \
-            -var="environment_vars=${{ inputs.environment_vars }}" \
+            $(if [ -n "${{ inputs.environment_vars }}" ]; then
+                echo "-var=\"environment_vars=${{ inputs.environment_vars }}\""
+              fi) \
             -out=lambdaplan
 
       - name: Terraform Apply