diff --git a/config.c b/config.c
index 6588cf579f..e1d66a145b 100644
--- a/config.c
+++ b/config.c
@@ -498,7 +498,7 @@ static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 	return 0;
 }
 
-int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
+static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 {
 	if (value && *value) {
 		char *end;