diff --git a/lib/krb5/addr_families.c b/lib/krb5/addr_families.c
index 82d979ba0..97c8a32ea 100644
--- a/lib/krb5/addr_families.c
+++ b/lib/krb5/addr_families.c
@@ -218,7 +218,7 @@ krb5_sockaddr2address (const struct sockaddr *sa, krb5_address *addr)
 }
 
 size_t
-krb5_max_sockaddr_size ()
+krb5_max_sockaddr_size (void)
 {
     if (max_sockaddr_size == 0) {
 	struct addr_operations *a;