diff --git a/scripts/build/Dockerfile.tmpl b/scripts/build/Dockerfile.tmpl
index 27699582e..eafe7d80b 100644
--- a/scripts/build/Dockerfile.tmpl
+++ b/scripts/build/Dockerfile.tmpl
@@ -22,3 +22,5 @@ COPY . /criu
 WORKDIR /criu
 
 RUN make clean && make -j $(nproc)
+RUN make mrproper
+RUN bash -c 'CLEAN="$(git clean -ndx --exclude=scripts/build)"; echo "${CLEAN}"; test -z "${CLEAN}"; exit $?'