diff --git a/gdk/broadway/broadway-server.c b/gdk/broadway/broadway-server.c
index 0098ea588f..114c6505ca 100644
--- a/gdk/broadway/broadway-server.c
+++ b/gdk/broadway/broadway-server.c
@@ -368,7 +368,7 @@ update_future_pointer_info (BroadwayServer *server, BroadwayInputPointerMsg *dat
 }
 
 static void
-parse_input_message (BroadwayInput *input, const char *message)
+parse_input_message (BroadwayInput *input, const unsigned char *message)
 {
   BroadwayServer *server = input->server;
   BroadwayInputMsg msg;