diff --git a/libs/ardour/vst_plugin.cc b/libs/ardour/vst_plugin.cc
index e5d9b65b40..9887e74680 100644
--- a/libs/ardour/vst_plugin.cc
+++ b/libs/ardour/vst_plugin.cc
@@ -191,10 +191,9 @@ VSTPlugin::set_parameter (uint32_t which, float newval, sampleoffset_t when)
 		if (0 != rv) {
 			_eff_bypassed = (value == 1);
 		} else {
-			cerr << "effSetBypass failed rv=" << rv << endl; // XXX DEBUG
-#ifdef ALLOW_VST_BYPASS_TO_FAIL // yet unused, see also vst_plugin.cc
-			// emit signal.. hard un/bypass from here?!
-#endif
+			/* TODO: hard-bypass effect, emit signal, and ensure that the
+			 * plugin is reactivated on the next call to this function..
+			 */
 		}
 		return;
 	}