diff --git a/libs/ardour/vst_plugin.cc b/libs/ardour/vst_plugin.cc
index 0b2bc6afca..189dd93b5c 100644
--- a/libs/ardour/vst_plugin.cc
+++ b/libs/ardour/vst_plugin.cc
@@ -549,7 +549,7 @@ VSTPlugin::connect_and_run (BufferSet& bufs,
 	*/
 
 	float** ins = (float**)alloca(_plugin->numInputs*sizeof(float*));
-	float** outs = (float**)alloca(_plugin->numInputs*sizeof(float*));
+	float** outs = (float**)alloca(_plugin->numOutputs*sizeof(float*));
 
 	int32_t i;