diff --git a/win/shim/winshim.c b/win/shim/winshim.c
index ae4caed12..fdbe18b9e 100644
--- a/win/shim/winshim.c
+++ b/win/shim/winshim.c
@@ -191,7 +191,7 @@ win_request_info *
 shim_ctrl_nhwindow(
     winid window UNUSED,
     int request UNUSED,
-    win_request_info *wri) {
+    win_request_info *wri UNUSED) {
     return (win_request_info *) 0;
 }
 #else /* !__EMSCRIPTEN__ */