diff --git a/Dockerfile.run b/Dockerfile.run
index 4edaf6f..bc5db60 100644
--- a/Dockerfile.run
+++ b/Dockerfile.run
@@ -1,7 +1,7 @@
 FROM alpine
 
 RUN apk --update add ca-certificates
-RUN mkdir /app/pwd
+RUN mkdir -p /app/pwd
 
 ADD play-with-docker /app/play-with-docker
 COPY ./www /app/www