diff --git a/run-command.c b/run-command.c
index 6bd16acb06..ba617655b2 100644
--- a/run-command.c
+++ b/run-command.c
@@ -341,19 +341,19 @@ static void child_close_pair(int fd[2])
 	child_close(fd[1]);
 }
 
-static void child_error_fn(const char *err, va_list params)
+static void child_error_fn(const char *err UNUSED, va_list params UNUSED)
 {
 	const char msg[] = "error() should not be called in child\n";
 	xwrite(2, msg, sizeof(msg) - 1);
 }
 
-static void child_warn_fn(const char *err, va_list params)
+static void child_warn_fn(const char *err UNUSED, va_list params UNUSED)
 {
 	const char msg[] = "warn() should not be called in child\n";
 	xwrite(2, msg, sizeof(msg) - 1);
 }
 
-static void NORETURN child_die_fn(const char *err, va_list params)
+static void NORETURN child_die_fn(const char *err UNUSED, va_list params UNUSED)
 {
 	const char msg[] = "die() should not be called in child\n";
 	xwrite(2, msg, sizeof(msg) - 1);