diff --git a/gtk2_ardour/lv2_plugin_ui.cc b/gtk2_ardour/lv2_plugin_ui.cc
index f83ff7384c..812f2640a7 100644
--- a/gtk2_ardour/lv2_plugin_ui.cc
+++ b/gtk2_ardour/lv2_plugin_ui.cc
@@ -159,7 +159,7 @@ LV2PluginUI::package (Gtk::Window& win)
 bool
 LV2PluginUI::configure_handler (GdkEventConfigure* ev)
 {
-	cout << "CONFIGURE" << endl;
+	std::cout << "CONFIGURE" << std::endl;
 	return false;
 }
 
diff --git a/libs/ardour/ardour/lv2_plugin.h b/libs/ardour/ardour/lv2_plugin.h
index 7daf4ed2b1..e7a755e4fc 100644
--- a/libs/ardour/ardour/lv2_plugin.h
+++ b/libs/ardour/ardour/lv2_plugin.h
@@ -116,7 +116,7 @@ class LV2Plugin : public ARDOUR::Plugin
 	XMLNode& get_state();
 	int      set_state(const XMLNode& node);
 	bool     save_preset(std::string uri);
-	bool     load_preset(const string uri);
+	bool     load_preset(const std::string uri);
 	virtual std::vector<Plugin::PresetRecord> get_presets();
 
 	bool has_editor() const;
@@ -136,8 +136,8 @@ class LV2Plugin : public ARDOUR::Plugin
 	float*                   _defaults;
 	float*                   _latency_control_port;
 	bool                     _was_activated;
-	vector<bool>             _port_is_input;
-	map<string,uint32_t>     _port_indices;
+	std::vector<bool>        _port_is_input;
+	std::map<std::string,uint32_t> _port_indices;
 
 	typedef struct { const void* (*extension_data)(const char* uri); } LV2_DataAccess;
 	LV2_DataAccess _data_access_extension_data;