diff --git a/builtin-receive-pack.c b/builtin-receive-pack.c
index f7e04c4..849f1fe 100644
--- a/builtin-receive-pack.c
+++ b/builtin-receive-pack.c
@@ -244,7 +244,7 @@
 {
 	int i;
 	for (i = 0; i < ARRAY_SIZE(warn_unconfigured_deny_msg); i++)
-		warning(warn_unconfigured_deny_msg[i]);
+		warning("%s", warn_unconfigured_deny_msg[i]);
 }
 
 static char *warn_unconfigured_deny_delete_current_msg[] = {
@@ -270,7 +270,7 @@
 	for (i = 0;
 	     i < ARRAY_SIZE(warn_unconfigured_deny_delete_current_msg);
 	     i++)
-		warning(warn_unconfigured_deny_delete_current_msg[i]);
+		warning("%s", warn_unconfigured_deny_delete_current_msg[i]);
 }
 
 static const char *update(struct command *cmd)