diff -uNrp a/src/core/util.c b/src/core/util.c
--- a/src/core/util.c	2023-03-16 13:59:31.000000000 +0000
+++ b/src/core/util.c	2023-05-06 16:08:21.162593775 +0100
@@ -634,8 +634,6 @@ meta_show_dialog (const char *type,
       append_argument (args, display);
     }
 
-  append_argument (args, "--class");
-  append_argument (args, "mutter-dialog");
   append_argument (args, "--title");
   append_argument (args, "");
   append_argument (args, "--text");
@@ -661,7 +659,7 @@ meta_show_dialog (const char *type,
 
   if (icon_name)
     {
-      append_argument (args, "--icon-name");
+      append_argument (args, "--icon");
       append_argument (args, icon_name);
     }