diff --git a/gdk/broadway/gdkbroadway-server.c b/gdk/broadway/gdkbroadway-server.c
index 02b6f93183..e6b96ff0b9 100644
--- a/gdk/broadway/gdkbroadway-server.c
+++ b/gdk/broadway/gdkbroadway-server.c
@@ -235,7 +235,7 @@ static void
 parse_all_input (GdkBroadwayServer *server)
 {
   guint8 *p, *end;
-  size_t size;
+  guint32 size;
   BroadwayReply *reply;
 
   p = server->recv_buffer;