diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 4ffdd7813..076d93691 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -11,7 +11,7 @@ variables:
   ${{ if startsWith(variables['Build.SourceBranch'], 'refs/heads/') }}:
     branchName: ${{ replace(variables['Build.SourceBranchName'], 'refs/heads/', '') }}
   ${{ if startsWith(variables['Build.SourceBranch'], 'refs/pull/') }}:
-    branchName: ${{ replace(variables['System.PullRequest.SourceBranch'], 'refs/heads/', '') }}
+    branchName: $(System.PullRequest.SourceBranch)
 
 stages:
   - stage: Lint
diff --git a/proxy/azure-pipelines.yml b/proxy/azure-pipelines.yml
index 71590480b..700da97e5 100644
--- a/proxy/azure-pipelines.yml
+++ b/proxy/azure-pipelines.yml
@@ -5,7 +5,7 @@ variables:
   ${{ if startsWith(variables['Build.SourceBranch'], 'refs/heads/') }}:
     branchName: ${{ replace(variables['Build.SourceBranchName'], 'refs/heads/', '') }}
   ${{ if startsWith(variables['Build.SourceBranch'], 'refs/pull/') }}:
-    branchName: ${{ replace(variables['System.PullRequest.SourceBranch'], 'refs/heads/', '') }}
+    branchName: $(System.PullRequest.SourceBranch)
 
 stages:
   - stage: generate
diff --git a/web/azure-pipelines.yml b/web/azure-pipelines.yml
index 0771a4dea..564e1aeed 100644
--- a/web/azure-pipelines.yml
+++ b/web/azure-pipelines.yml
@@ -5,7 +5,7 @@ variables:
   ${{ if startsWith(variables['Build.SourceBranch'], 'refs/heads/') }}:
     branchName: ${{ replace(variables['Build.SourceBranchName'], 'refs/heads/', '') }}
   ${{ if startsWith(variables['Build.SourceBranch'], 'refs/pull/') }}:
-    branchName: ${{ replace(variables['System.PullRequest.SourceBranch'], 'refs/heads/', '') }}
+    branchName: $(System.PullRequest.SourceBranch)
 
 stages:
   - stage: lint