diff --git a/Dockerfile b/Dockerfile
index a394e97..2370467 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ COPY . .
 RUN make build
 
 WORKDIR /go
-RUN tar cvfz go-src.tgz src && du -sh *
+RUN tar cfz go-src.tgz src && du -sh *
 
 # this container doesn't do anything except hold the build artifact
 # and make sure it compiles.