diff --git a/gulpfile.js b/gulpfile.js
index 6fdeacffe..4a2ed0bcd 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -195,7 +195,9 @@ gulp.task('docker-compose', async () => {
             container_name: `${namePrefix}${serviceName}`,
             image: `${serviceName}:${imageTag}`
         });
-        service.build.labels['salix.tag'] = imageTag;
+        service.build.labels = {
+            'salix.tag': imageTag
+        };
     }
 
     let ymlString = yaml.safeDump(composeYml);