diff --git a/externals/miXed/shared/sickle/arsic.c b/externals/miXed/shared/sickle/arsic.c
index fe9f5954fcdfb45fd001bc5cfef996d45d072c17..b66f36b2e436db5db87990ad2476abb318d116f9 100644
--- a/externals/miXed/shared/sickle/arsic.c
+++ b/externals/miXed/shared/sickle/arsic.c
@@ -217,6 +217,6 @@ void arsic_setup(t_class *c, void *dspfn, void *floatfn)
 	}
 	else CLASS_MAINSIGNALIN(c, t_sic, s_f);
     }
-    class_addmethod(c, (t_method)dspfn, gensym("dsp"), 0);
+    class_addmethod(c, (t_method)dspfn, gensym("dsp"), A_CANT, 0);
     class_addmethod(c, (t_method)arsic_enable, gensym("enable"), 0);
 }
diff --git a/externals/miXed/shared/sickle/sic.c b/externals/miXed/shared/sickle/sic.c
index 3630b2b7b4206348de65fd1b8c70eb3e3e947633..518e7818d0a08f82387b1d9d60ff910be28cdbea 100644
--- a/externals/miXed/shared/sickle/sic.c
+++ b/externals/miXed/shared/sickle/sic.c
@@ -116,6 +116,6 @@ void sic_setup(t_class *c, void *dspfn, void *floatfn)
 	}
 	else CLASS_MAINSIGNALIN(c, t_sic, s_f);
     }
-    class_addmethod(c, (t_method)dspfn, gensym("dsp"), 0);
+    class_addmethod(c, (t_method)dspfn, gensym("dsp"), A_CANT, 0);
     class_addmethod(c, (t_method)sic_enable, gensym("enable"), 0);
 }