diff --git a/externals/k_vst~/k_vst~.c b/externals/k_vst~/k_vst~.c
index 0353ef545be331df075ddc867d08d2088370fdf7..a6c92c01bc12ea94dcebc380f5f5d8e7cc229103 100644
--- a/externals/k_vst~/k_vst~.c
+++ b/externals/k_vst~/k_vst~.c
@@ -200,7 +200,7 @@ k_vst_tilde_setup (void)
     class_addmethod (plugin_tilde_class,
 		     (t_method)plugin_tilde_dsp,
 		     gensym ("dsp"),
-		     0);
+		     A_CANT, 0);
 
     /* Set the callback for "control" messages in the first inlet;
        this is a message of our own for changing LADSPA control