diff --git a/Weather/SerialReader/deploy/azure-pipelines.yml b/Weather/SerialReader/deploy/azure-pipelines.yml
index be8e4c2..e349925 100644
--- a/Weather/SerialReader/deploy/azure-pipelines.yml
+++ b/Weather/SerialReader/deploy/azure-pipelines.yml
@@ -34,9 +34,7 @@ steps:
 - task: Bash@3
   inputs:
     targetType: 'inline'
-    script: 'sed -i s/#TAG#/$TAG/ Weather/SerialReader/deploy/manifest.yaml'
-  env:
-    Tag: $(Build.BuildNumber)
+    script: 'sed -i s/#TAG#/$BUILD_BUILDNUMBER/ Weather/SerialReader/deploy/manifest.yaml'
 
 - task: PublishBuildArtifacts@1
   inputs: