diff --git a/osbs/build/build_request.py b/osbs/build/build_request.py
index 683b31b78..ae0c31f58 100644
--- a/osbs/build/build_request.py
+++ b/osbs/build/build_request.py
@@ -863,7 +863,7 @@ def render(self, validate=True):
         koji_task_id = self.spec.koji_task_id.value
         if koji_task_id is not None:
             self.template['metadata'].setdefault('labels', {})
-            self.template['metadata']['labels']['koji-task-id'] = koji_task_id
+            self.template['metadata']['labels']['koji-task-id'] = str(koji_task_id)
 
         use_auth = self.spec.use_auth.value
         self.render_add_filesystem()
diff --git a/osbs/core.py b/osbs/core.py
index 8773adea4..89526b165 100755
--- a/osbs/core.py
+++ b/osbs/core.py
@@ -485,7 +485,7 @@ def list_builds(self, build_config_id=None, koji_task_id=None,
             label['buildconfig'] = build_config_id
 
         if koji_task_id is not None:
-            label['koji-task-id'] = koji_task_id
+            label['koji-task-id'] = str(koji_task_id)
 
         if label:
             query['labelSelector'] = ','.join([selector.format(key=key,
diff --git a/tests/build/test_build_request.py b/tests/build/test_build_request.py
index 9b72e4a6f..63045edfc 100644
--- a/tests/build/test_build_request.py
+++ b/tests/build/test_build_request.py
@@ -272,7 +272,7 @@ def test_render_prod_request_with_repo(self, architecture, build_image, build_im
         build_json = build_request.render()
 
         assert build_json["metadata"]["name"] == TEST_BUILD_CONFIG
-        assert build_json["metadata"]["labels"]["koji-task-id"] == koji_task_id
+        assert build_json["metadata"]["labels"]["koji-task-id"] == str(koji_task_id)
         assert "triggers" not in build_json["spec"]
         assert build_json["spec"]["source"]["git"]["uri"] == TEST_GIT_URI
         assert build_json["spec"]["source"]["git"]["ref"] == TEST_GIT_REF
@@ -1186,7 +1186,7 @@ def test_render_prod_request_with_koji_secret(self, tmpdir):
         build_request.set_params(**kwargs)
         build_json = build_request.render()
 
-        assert build_json["metadata"]["labels"]["koji-task-id"] == koji_task_id
+        assert build_json["metadata"]["labels"]["koji-task-id"] == str(koji_task_id)
 
         plugins = get_plugins_from_build_json(build_json)
         assert get_plugin(plugins, "exit_plugins", "koji_promote")