diff --git a/externals/cxc/delta~.c b/externals/cxc/delta~.c
index 01b59fd5fde6522bf45a0bc1f11666f47d9446e7..ba8d0e0c4bfec0d5bbd32b5f366622e66c522c5c 100644
--- a/externals/cxc/delta~.c
+++ b/externals/cxc/delta~.c
@@ -51,5 +51,5 @@ void delta_tilde_setup(void)
   delta_class = class_new(gensym("delta~"), (t_newmethod)delta_new, 0,
 			  sizeof(t_delta), 0, A_DEFFLOAT, 0);
   class_addmethod(delta_class, nullfn, gensym("signal"), 0);
-  class_addmethod(delta_class, (t_method)delta_dsp, gensym("dsp"), 0);
+  class_addmethod(delta_class, (t_method)delta_dsp, gensym("dsp"), A_CANT, 0);
 }
diff --git a/externals/cxc/mean~.c b/externals/cxc/mean~.c
index 223152aa43fce4f37d01fef0c345942a7e4fb889..54cfc71b7a06fa6d08637bfae55fb4615f7db41c 100644
--- a/externals/cxc/mean~.c
+++ b/externals/cxc/mean~.c
@@ -431,7 +431,7 @@ void mean_tilde_setup(void)
   class_addmethod(mean_tilde_class, nullfn, gensym("signal"), 0);
   class_addmethod(mean_tilde_class,
 		  (t_method)mean_tilde_dsp,
-		  gensym("dsp"), 0);
+		  gensym("dsp"), A_CANT, 0);
   class_addmethod(mean_tilde_class, (t_method)mean_tilde_set,
 		  gensym("set"), A_DEFSYM, 0);
   class_addmethod(mean_tilde_class, (t_method)mean_tilde_mean,
diff --git a/externals/cxc/random1~.c b/externals/cxc/random1~.c
index 0c03fd7de9bf28419d668f87eb04f8de981be425..f14f2b1f69837ba761f07d1bc83630bc6df3189f 100644
--- a/externals/cxc/random1~.c
+++ b/externals/cxc/random1~.c
@@ -111,5 +111,5 @@ void random1_tilde_setup(void)
 				  (t_newmethod)random1_tilde_new,
 				  0, sizeof(t_random1_tilde), 0, 0);
   class_addmethod(random1_tilde_class, (t_method)random1_tilde_seed,gensym("seed"), A_FLOAT, 0);
-  class_addmethod(random1_tilde_class, (t_method)random1_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(random1_tilde_class, (t_method)random1_tilde_dsp, gensym("dsp"), A_CANT, 0);
 }
diff --git a/externals/cxc/random_fl~.c b/externals/cxc/random_fl~.c
index 83b43472818bb8b95056a380231ed62d22d21009..8747193e64bb019454445df3c4b0145e25592f0c 100644
--- a/externals/cxc/random_fl~.c
+++ b/externals/cxc/random_fl~.c
@@ -96,5 +96,5 @@ void random_fl_tilde_setup(void)
 				    sizeof(t_random_fl_tilde), 0, 0);
   class_addmethod(random_fl_tilde_class, (t_method)random_fl_tilde_seed,
 		  gensym("seed"), A_FLOAT, 0);
-  class_addmethod(random_fl_tilde_class, (t_method)random_fl_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(random_fl_tilde_class, (t_method)random_fl_tilde_dsp, gensym("dsp"), A_CANT, 0);
 }
diff --git a/externals/cxc/random_icg~.c b/externals/cxc/random_icg~.c
index 178814b96cb4cdd067ff3e29e5021b4c6e35ce4b..5533254786774291c72f09829dcd683d5c8f4f64 100644
--- a/externals/cxc/random_icg~.c
+++ b/externals/cxc/random_icg~.c
@@ -160,5 +160,5 @@ void random_icg_tilde_setup(void)
 			    sizeof(t_random_icg_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
   class_addmethod(random_icg_tilde_class, (t_method)random_icg_tilde_seed,
 		  gensym("seed"), A_FLOAT, 0);
-  class_addmethod(random_icg_tilde_class, (t_method)random_icg_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(random_icg_tilde_class, (t_method)random_icg_tilde_dsp, gensym("dsp"), A_CANT, 0);
 }
diff --git a/externals/cxc/reson~.c b/externals/cxc/reson~.c
index 26aa245a82ad7bcbe5273097a9e2599d99f86d90..7bca2e04fcf5c6a3f0c92dac2c4b370eda96820f 100644
--- a/externals/cxc/reson~.c
+++ b/externals/cxc/reson~.c
@@ -151,6 +151,6 @@ void reson_tilde_setup()
 	class_addfloat(sigreson_class, (t_method)sigreson_float);
 	class_addmethod(sigreson_class, (t_method)sigreson_ft1, gensym("ft1"), A_FLOAT, 0);
 	class_addmethod(sigreson_class, (t_method)nullfn, &s_signal, A_NULL);
-	class_addmethod(sigreson_class, (t_method)sigreson_dsp, gensym("dsp"), A_NULL);
+	class_addmethod(sigreson_class, (t_method)sigreson_dsp, gensym("dsp"), A_CANT, A_NULL);
 }