diff --git a/buildspec-staging.yml b/buildspec-staging.yml
index f66ce03..c76e162 100644
--- a/buildspec-staging.yml
+++ b/buildspec-staging.yml
@@ -52,7 +52,7 @@ phases:
       - echo docker image git tag - $ECR_REPOSITORY_URI:$IMAGE_TAG
       - docker push $ECR_REPOSITORY_URI:$IMAGE_TAG
       - echo "Writing image definitions file..."
-      - printf '[{"name":"$ECS_CONTAINER_NAME","imageUri":"%s"}]' $ECR_REPOSITORY_URI:$IMAGE_TAG > imagedefinitions.json
+      - printf '[{"name":"%s","imageUri":"%s"}]' "$ECS_CONTAINER_NAME" "$ECR_REPOSITORY_URI:$IMAGE_TAG" > imagedefinitions.json
       - echo "Retrieve the latest task definition ARN..."
       - |
         latest_arn=$(aws ecs list-task-definitions \
diff --git a/buildspec.yml b/buildspec.yml
index 6a405fd..b699780 100644
--- a/buildspec.yml
+++ b/buildspec.yml
@@ -62,7 +62,7 @@ phases:
       - docker push $ECR_REPOSITORY_URI:$IMAGE_TAG
       - docker push $ECR_REPOSITORY_URI:latest
       - echo "Writing image definitions file..."
-      - printf '[{"name":"$ECS_CONTAINER_NAME","imageUri":"%s"}]' $ECR_REPOSITORY_URI:$IMAGE_TAG > imagedefinitions.json
+      - printf '[{"name":"%s","imageUri":"%s"}]' "$ECS_CONTAINER_NAME" "$ECR_REPOSITORY_URI:$IMAGE_TAG" > imagedefinitions.json
       - echo "Retrieve the latest task definition ARN..."
       - |
         latest_arn=$(aws ecs list-task-definitions \