diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index eb11e45a..d4994efa 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -181,7 +181,7 @@ jobs:
       GH_TOKEN: $(GH_TOKEN)
       APPSTORE_USERNAME: $(APPSTORE_USERNAME)
       APPSTORE_PASSWORD: $(APPSTORE_PASSWORD)
-      BRANCH: $[ variables['Build.SourceBranch'] ]
+      BRANCH: $(BUILD_SOURCEBRANCH)
 
   - task: CopyFiles@2
     inputs: