diff --git a/repoman.Dockerfile b/repoman.Dockerfile
index 8abc9b2..8ffb421 100644
--- a/repoman.Dockerfile
+++ b/repoman.Dockerfile
@@ -8,6 +8,9 @@ ENV MAKEOPTS "-j1"
 ENV USE "minimal -cracklib -curl -gpg -idn -ncurses -net -nls \
     -pam -pcre -pcre-jit -perl -readline -rsync-verify -ssl -webdav"
 ENV FEATURES "-ipc-sandbox -network-sandbox -pid-sandbox -sandbox -usersandbox"
+ENV COMMON_FLAGS="-Os -pipe"
+ENV CFLAGS="${COMMON_FLAGS}"
+ENV CXXFLAGS="${COMMON_FLAGS}"
 RUN eselect profile set default/linux/amd64/17.1/no-multilib
 RUN emerge --root=/workdir --quiet app-portage/repoman dev-vcs/git
 RUN emerge --root=/workdir --rage-clean --quiet \