diff --git a/run-command.c b/run-command.c
index 79a0a763ec61c0195711606b771f717dbbaab7c4..a47699966c59f708683e439bcd3296d5fce8acf5 100644
--- a/run-command.c
+++ b/run-command.c
@@ -636,7 +636,7 @@ static struct {
 
 static int git_atexit_installed;
 
-static void git_atexit_dispatch()
+static void git_atexit_dispatch(void)
 {
 	size_t i;
 
@@ -644,7 +644,7 @@ static void git_atexit_dispatch()
 		git_atexit_hdlrs.handlers[i-1]();
 }
 
-static void git_atexit_clear()
+static void git_atexit_clear(void)
 {
 	free(git_atexit_hdlrs.handlers);
 	memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs));