diff --git a/ci/lib.sh b/ci/lib.sh
index 16f4ecbc67..cee51a4cc4 100755
--- a/ci/lib.sh
+++ b/ci/lib.sh
@@ -185,4 +185,4 @@ GIT_TEST_GETTEXT_POISON)
 	;;
 esac
 
-export MAKEFLAGS="CC=${CC:-cc}"
+export MAKEFLAGS="$MAKEFLAGS CC=${CC:-cc}"