diff --git a/sync/device.c b/sync/device.c
index e8730d2..26e1186 100644
--- a/sync/device.c
+++ b/sync/device.c
@@ -20,7 +20,7 @@ static const char *sync_track_path(const char *base, const char *name)
 
 #ifndef SYNC_PLAYER
 
-static SOCKET server_connect(const char *host, int nport)
+static SOCKET server_connect(const char *host, unsigned short nport)
 {
 	struct hostent *he;
 	struct sockaddr_in sa;
@@ -222,7 +222,7 @@ static int purge_and_rerequest(struct sync_device *d)
 	return 0;
 }
 
-int sync_connect(struct sync_device *d, const char *host, int port)
+int sync_connect(struct sync_device *d, const char *host, unsigned short port)
 {
 	if (d->sock != INVALID_SOCKET)
 		closesocket(d->sock);
diff --git a/sync/sync.h b/sync/sync.h
index c77c40e..d571ec1 100644
--- a/sync/sync.h
+++ b/sync/sync.h
@@ -23,7 +23,7 @@ struct sync_cb {
 };
 void sync_set_callbacks(struct sync_device *, struct sync_cb *, void *);
 #define SYNC_DEFAULT_PORT 1338
-int sync_connect(struct sync_device *, const char *, int port);
+int sync_connect(struct sync_device *, const char *, unsigned short);
 int sync_update(struct sync_device *, int);
 #endif /* !defined(SYNC_PLAYER) */