diff --git a/plugins/builder-herokuish/dockerfiles/builder-release.Dockerfile b/plugins/builder-herokuish/dockerfiles/builder-release.Dockerfile
index 3656d8b9c..d887ca7e5 100644
--- a/plugins/builder-herokuish/dockerfiles/builder-release.Dockerfile
+++ b/plugins/builder-herokuish/dockerfiles/builder-release.Dockerfile
@@ -3,5 +3,5 @@ FROM $APP_IMAGE
 
 ARG DOKKU_APP_USER herokuishuser
 COPY --chown=$DOKKU_APP_USER 00-global-env.sh 01-app-env.sh /app/.profile.d/
-RUN chown -R $DOKKU_APP_USER:$DOKKU_APP_USER /app
+RUN chown -R "$DOKKU_APP_USER:$DOKKU_APP_USER" /app
 USER $DOKKU_APP_USER