diff --git a/libs/ardour/vst3_plugin.cc b/libs/ardour/vst3_plugin.cc
index a588b298cc..fed21773de 100644
--- a/libs/ardour/vst3_plugin.cc
+++ b/libs/ardour/vst3_plugin.cc
@@ -354,18 +354,15 @@ VST3Plugin::reconfigure_io (ChanCount in, ChanCount aux_in, ChanCount out)
 	DEBUG_TRACE (DEBUG::VST3Config, string_compose ("VST3Plugin::reconfigure_io in: %1 aux: %2 out: %3 ; n_in=%4 n_out=%5\n",
 	                                                in, aux_in, out, _plug->n_audio_inputs (), _plug->n_audio_outputs ()));
 
-	assert (_plug->n_audio_inputs () >= in.n_audio () + aux_in.n_audio ());
-	assert (_plug->n_audio_outputs () >= out.n_audio ());
-
 	_connected_inputs.clear ();
 	_connected_inputs.resize (in.n_audio () + aux_in.n_audio ());
 	_connected_inputs.flip ();
-	_connected_inputs.resize (_plug->n_audio_inputs ());
+	_connected_inputs.resize (std::max (_plug->n_audio_inputs (), in.n_audio () + aux_in.n_audio ()));
 
 	_connected_outputs.clear ();
 	_connected_outputs.resize (out.n_audio ());
 	_connected_outputs.flip ();
-	_connected_outputs.resize (_plug->n_audio_outputs ());
+	_connected_outputs.resize (std::max (_plug->n_audio_outputs (), out.n_audio ()));
 
 	_plug->enable_io (_connected_inputs, _connected_outputs);
 	return true;