diff --git a/diff.c b/diff.c
index 8c78fce49d..bfd1bd2410 100644
--- a/diff.c
+++ b/diff.c
@@ -4623,6 +4623,7 @@ static const char rename_limit_advice[] =
 
 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
 {
+	fflush(stdout);
 	if (degraded_cc)
 		warning(degrade_cc_to_c_warning);
 	else if (needed)