diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index c46f1e06de5..cadf60992c5 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -575,7 +575,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args, struct sockaddr **addr_ret
    through len_ret. */
 
 static int
-getsockaddrlen(PySocketSockObject *s, int *len_ret)
+getsockaddrlen(PySocketSockObject *s, unsigned int *len_ret)
 {
 	switch (s->sock_family) {