diff --git a/builtin/fast-import.c b/builtin/fast-import.c
index 7134683ab9..4a8c835062 100644
--- a/builtin/fast-import.c
+++ b/builtin/fast-import.c
@@ -436,7 +436,7 @@ static void set_checkpoint_signal(void)
 
 #else
 
-static void checkpoint_signal(int signo)
+static void checkpoint_signal(int signo UNUSED)
 {
 	checkpoint_requested = 1;
 }
diff --git a/builtin/log.c b/builtin/log.c
index 04412dd9c9..813b768e24 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -436,7 +436,7 @@ static void log_show_early(struct rev_info *revs, struct commit_list *list)
 	setitimer(ITIMER_REAL, &early_output_timer, NULL);
 }
 
-static void early_output(int signal)
+static void early_output(int signal UNUSED)
 {
 	show_early_output = log_show_early;
 }
diff --git a/daemon.c b/daemon.c
index 0ae7d12b5c..06d5bc6931 100644
--- a/daemon.c
+++ b/daemon.c
@@ -928,7 +928,7 @@ static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
 		add_child(&cld, addr, addrlen);
 }
 
-static void child_handler(int signo)
+static void child_handler(int signo UNUSED)
 {
 	/*
 	 * Otherwise empty handler because systemcalls will get interrupted
diff --git a/progress.c b/progress.c
index 0cdd875d37..9b33a2df32 100644
--- a/progress.c
+++ b/progress.c
@@ -59,7 +59,7 @@ void progress_test_force_update(void)
 }
 
 
-static void progress_interval(int signum)
+static void progress_interval(int signum UNUSED)
 {
 	progress_update = 1;
 }