diff --git a/net-misc/rsync/rsync-3.3.0-r1.ebuild b/net-misc/rsync/rsync-3.3.0-r1.ebuild
index 3a11a5ea88450..2c4a1bb28ccb6 100644
--- a/net-misc/rsync/rsync-3.3.0-r1.ebuild
+++ b/net-misc/rsync/rsync-3.3.0-r1.ebuild
@@ -109,7 +109,7 @@ src_prepare() {
 
 src_configure() {
 	# Should be fixed upstream in next release (>3.3.0) (bug #943745)
-	append-cflags -std=gnu17
+	append-cflags $(test-flags-CC -std=gnu17)
 
 	local myeconfargs=(
 		--with-rsyncd-conf="${EPREFIX}"/etc/rsyncd.conf