diff --git a/Jenkinsfile b/Jenkinsfile
index 2b1e16e..37ea54f 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -17,7 +17,7 @@ pipeline {
                     if(env.BRANCH_NAME == "master") {
                        tag = "latest"
                     } else {
-                       tag = env.BRANCH_NAME
+                       tag = env.BRANCH_NAME.toLowerCase()
                     }
                     if(!imagename){
                         echo "You must define an imagename in common.bash"