diff --git a/azure-pipelines-official.yml b/azure-pipelines-official.yml
index 57b0f66bb..b1fdb23cc 100644
--- a/azure-pipelines-official.yml
+++ b/azure-pipelines-official.yml
@@ -7,8 +7,10 @@ trigger:
 pr: none
 
 variables:
-  - name: prereleaseFlag
-    value: ''
+  ${{ if eq(variables['Build.SourceBranchName'], 'release') }}:
+    prereleaseFlag: ''
+  ${{ else }}:
+    prereleaseFlag: '--prerelease'
 
 stages:
 - stage: Build
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index bb9de852d..039f169a3 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -14,8 +14,10 @@ pr:
 - main
 
 variables:
-  - name: prereleaseFlag
-    value: ''
+  ${{ if eq(variables['Build.SourceBranchName'], 'release') }}:
+    prereleaseFlag: ''
+  ${{ else }}:
+    prereleaseFlag: '--prerelease'
 
 stages:
 - stage: Build