diff --git a/automation/Jenkinsfile b/automation/Jenkinsfile
index eefcdabf4..595f6963f 100644
--- a/automation/Jenkinsfile
+++ b/automation/Jenkinsfile
@@ -15,7 +15,7 @@ pipeline {
             }
             when {
                 anyOf {
-                    changeset "$DOCK_FILE_DIR/Dockerfile";
+                    changeset "${DOCK_FILE_DIR}/Dockerfile";
                     changelog 'cleanDocker'
                 }
             }