diff --git a/dockerfiles/demo.dockerfile b/dockerfiles/demo.dockerfile
index 8ae307d..3c5a1b8 100644
--- a/dockerfiles/demo.dockerfile
+++ b/dockerfiles/demo.dockerfile
@@ -5,6 +5,7 @@ ENV DEMO_HOME /shm-demo
 WORKDIR /
 # start from project home dir
 COPY . $DEMO_HOME
+RUN rm -rf $DEMO_HOME/build
 RUN mkdir $DEMO_HOME/build
 WORKDIR /$DEMO_HOME/build