diff --git a/src/xwidget.c b/src/xwidget.c
index 4d1d1169af9..614eb46d932 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -104,7 +104,7 @@ static void mouse_target_changed (WebKitWebView *, WebKitHitTestResult *, guint,
 
 DEFUN ("make-xwidget",
        Fmake_xwidget, Smake_xwidget,
-       5, 7, 0,
+       4, 7, 0,
        doc: /* Make an xwidget of TYPE.
 If BUFFER is nil, use the current buffer.
 If BUFFER is a string and no such buffer exists, create it.