diff --git a/libs/ardour/lxvst_plugin.cc b/libs/ardour/lxvst_plugin.cc
index 91ae757883..b71f9fa378 100644
--- a/libs/ardour/lxvst_plugin.cc
+++ b/libs/ardour/lxvst_plugin.cc
@@ -63,6 +63,8 @@ LXVSTPlugin::LXVSTPlugin (const LXVSTPlugin &other)
 	other.add_state (root);
 	set_state (*root, Stateful::loading_state_version);
 	delete root;
+
+	set_plugin (_state->plugin);
 }
 
 LXVSTPlugin::~LXVSTPlugin ()
diff --git a/libs/ardour/mac_vst_plugin.cc b/libs/ardour/mac_vst_plugin.cc
index 2cb7301ce8..8fc87aaeec 100644
--- a/libs/ardour/mac_vst_plugin.cc
+++ b/libs/ardour/mac_vst_plugin.cc
@@ -63,6 +63,8 @@ MacVSTPlugin::MacVSTPlugin (const MacVSTPlugin &other)
 	other.add_state (root);
 	set_state (*root, Stateful::loading_state_version);
 	delete root;
+
+	set_plugin (_state->plugin);
 }
 
 MacVSTPlugin::~MacVSTPlugin ()
diff --git a/libs/ardour/windows_vst_plugin.cc b/libs/ardour/windows_vst_plugin.cc
index 256d7f89a8..53bfee05e8 100644
--- a/libs/ardour/windows_vst_plugin.cc
+++ b/libs/ardour/windows_vst_plugin.cc
@@ -62,6 +62,8 @@ WindowsVSTPlugin::WindowsVSTPlugin (const WindowsVSTPlugin &other)
 	other.add_state (root);
 	set_state (*root, Stateful::loading_state_version);
 	delete root;
+
+	set_plugin (_state->plugin);
 }
 
 WindowsVSTPlugin::~WindowsVSTPlugin ()