diff --git a/apply.c b/apply.c
index fa9a02771c..6b4dbe0c88 100644
--- a/apply.c
+++ b/apply.c
@@ -125,7 +125,7 @@ void clear_apply_state(struct apply_state *state)
 	/* &state->fn_table is cleared at the end of apply_patch() */
 }
 
-static void mute_routine(const char *msg, va_list params)
+static void mute_routine(const char *msg UNUSED, va_list params UNUSED)
 {
 	/* do nothing */
 }