diff --git a/Dockerfile b/Dockerfile
index 03f9dd88..278f023e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,5 +6,6 @@ EXPOSE 80
 COPY . /src
 RUN cd /src && ./build.sh "$(cat VERSION)"
 
+ONBUILD COPY ./build.sh /src/build.sh
 ONBUILD COPY ./modules.go /src/modules.go
 ONBUILD RUN cd /src && ./build.sh "$(cat VERSION)-custom"