diff --git a/vars/commonPipelineEnvironment.groovy b/vars/commonPipelineEnvironment.groovy
index 75eeea771..d6a7c8da7 100644
--- a/vars/commonPipelineEnvironment.groovy
+++ b/vars/commonPipelineEnvironment.groovy
@@ -48,7 +48,7 @@ class commonPipelineEnvironment implements Serializable {
     // Useful for making sure that the piper binary uses the same file when called from Jenkins.
     String configurationFile = ''
 
-    String mtarFilePath = ""
+    String mtarFilePath = null
 
     String abapAddonDescriptor