diff --git a/libs/ardour/buffer_set.cc b/libs/ardour/buffer_set.cc
index 9f5a5a12bf..37128bc930 100644
--- a/libs/ardour/buffer_set.cc
+++ b/libs/ardour/buffer_set.cc
@@ -89,7 +89,7 @@ BufferSet::clear()
 #endif
 
 	for (LV2Buffers::iterator i = _lv2_buffers.begin(); i != _lv2_buffers.end(); ++i) {
-		free ((*i).second);
+		lv2_evbuf_free ((*i).second);
 	}
 	_lv2_buffers.clear ();