diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index a6a096c7d7..df930b0edf 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -36,6 +36,7 @@ jobs:
 - job: diff
   dependsOn: source
   steps:
+  - checkout: none
   - task: DownloadBuildArtifacts@0
     displayName: 'Download source'
     inputs: