diff --git a/vars/cpkg.groovy b/vars/cpkg.groovy
index a9cee19..0ed8aea 100644
--- a/vars/cpkg.groovy
+++ b/vars/cpkg.groovy
@@ -79,7 +79,7 @@ def call(Map params = [:]) {
             }
         }
 
-        versionNumber = "${versionNumber}-b${env.BUILD_NUMBER}"
+        versionNumber = "${versionNumber}-${env.BUILD_NUMBER}"
 
         println("New version number will be '${versionNumber}'")
         result['newVersionNumber'] = versionNumber