diff --git a/test/runner/lib/cloud/__init__.py b/test/runner/lib/cloud/__init__.py
index edf2d33a5f..b4e4d7a27a 100644
--- a/test/runner/lib/cloud/__init__.py
+++ b/test/runner/lib/cloud/__init__.py
@@ -319,7 +319,7 @@ class CloudProvider(CloudBase):
         :rtype: str
         """
         if is_shippable():
-            return 'shippable-%d-%d' % (
+            return 'shippable-%s-%s' % (
                 os.environ['SHIPPABLE_BUILD_NUMBER'],
                 os.environ['SHIPPABLE_JOB_NUMBER'],
             )