diff --git a/externals/olafmatt/shoutcast~/shoutcast~.c b/externals/olafmatt/shoutcast~/shoutcast~.c
index 957edd6b4fb6c1f2bc47d8875db32da5375c9fa2..44f004f65a85f7aac1b48e5ec9fb6b2dbc753b0d 100644
--- a/externals/olafmatt/shoutcast~/shoutcast~.c
+++ b/externals/olafmatt/shoutcast~/shoutcast~.c
@@ -1281,7 +1281,7 @@ void shoutcast_tilde_setup(void)
     CLASS_MAINSIGNALIN(shoutcast_class, t_shoutcast, x_f );
     class_addfloat(shoutcast_class, (t_method)shoutcast_float);
     class_addmethod(shoutcast_class, (t_method)shoutcast_disconnect, gensym("disconnect"), 0);
-    class_addmethod(shoutcast_class, (t_method)shoutcast_dsp, gensym("dsp"), 0);
+    class_addmethod(shoutcast_class, (t_method)shoutcast_dsp, gensym("dsp"), A_CANT, 0);
     class_addmethod(shoutcast_class, (t_method)shoutcast_connect, gensym("connect"), A_GIMME, 0);
     class_addmethod(shoutcast_class, (t_method)shoutcast_print, gensym("print"), 0);
     class_addmethod(shoutcast_class, (t_method)shoutcast_printlame, gensym("printlame"), 0);
@@ -1296,4 +1296,4 @@ void shoutcast_tilde_setup(void)
 	class_addmethod(shoutcast_class, (t_method)shoutcast_bcurl, gensym("url"), A_GIMME, 0);
 	class_addmethod(shoutcast_class, (t_method)shoutcast_bcpublic, gensym("public"), A_FLOAT, 0);
     class_sethelpsymbol(shoutcast_class, gensym("help-shoutcast~.pd"));
-}
\ No newline at end of file
+}