diff --git a/config.c b/config.c
index 314d8ee740..f116ce8738 100644
--- a/config.c
+++ b/config.c
@@ -556,6 +556,7 @@ int git_parse_ulong(const char *value, unsigned long *ret)
 	return 1;
 }
 
+NORETURN
 static void die_bad_number(const char *name, const char *value)
 {
 	const char *reason = errno == ERANGE ?