diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index 115f286e5c..54a8b03848 100644
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -2049,6 +2049,7 @@ LV2PluginInfo::LV2PluginInfo (const char* plugin_uri)
 LV2PluginInfo::~LV2PluginInfo()
 {
 	free(_plugin_uri);
+	_plugin_uri = NULL;
 }
 
 PluginPtr