diff --git a/Dockerfile b/Dockerfile
index c87af9b..4cf900b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,7 +8,7 @@ ARG maintainer=tier
 ARG imagename=shibboleth_idp
 ARG version=3.3.0
 ARG tierversion=17020
-ARG tierbuild=$BUILD_NUMBER
+ARG tierbuild=$tierbuild
 ENV VERSION=$version
 ENV TIERVERSION=$tierversion
 ENV TIERBUILD=$tierbuild
diff --git a/Jenkinsfile b/Jenkinsfile
index 9a6d125..a4bf331 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -19,6 +19,7 @@ node('docker') {
     def maintainer = maintainer()
     def imagename = imagename()
     def tag
+	def tierbuild=env.BUILD_NUMBER
     
     // Tag images created on master branch with 'latest'
     if(env.BRANCH_NAME == "master"){