diff --git a/build/WindowsAppSDK-SyncMirroredRepository.yml b/build/WindowsAppSDK-SyncMirroredRepository.yml
index 6333ca2cd8..5780e8ccc5 100644
--- a/build/WindowsAppSDK-SyncMirroredRepository.yml
+++ b/build/WindowsAppSDK-SyncMirroredRepository.yml
@@ -6,11 +6,12 @@ parameters:
     develop: develop
     main: main
     release/1.3-stable: release/1.3-stable
+    release/1.4-stable: release/1.4-stable
 
 jobs:
 - job: SyncMirror
   strategy:
-    matrix: 
+    matrix:
       ${{ each branches in parameters.SourceToTargetBranch }}:
         ${{ branches.key }}:
           SourceBranch: ${{ branches.key }}