diff --git a/infra/build/functions/request_build.py b/infra/build/functions/request_build.py
index 96807681d..4f835a10b 100644
--- a/infra/build/functions/request_build.py
+++ b/infra/build/functions/request_build.py
@@ -82,7 +82,7 @@ def run_build(project_name, image_project, build_steps, credentials, tag):
           'machineType': 'N1_HIGHCPU_32'
       },
       'logsBucket': build_project.GCB_LOGS_BUCKET,
-      'tags': [project_name + tag,],
+      'tags': [project_name + '-' + tag,],
       'queueTtl': str(QUEUE_TTL_SECONDS) + 's',
   }