diff --git a/gtk2_ardour/main.cc b/gtk2_ardour/main.cc
index 9b0a0c5e2f..3d4e2da20f 100644
--- a/gtk2_ardour/main.cc
+++ b/gtk2_ardour/main.cc
@@ -69,6 +69,10 @@
 #include "gtk2ardour-version.h"
 #endif
 
+#ifdef LXVST_SUPPORT
+#include <gdk/gdkx.h>
+#endif
+
 using namespace std;
 using namespace Gtk;
 using namespace ARDOUR_COMMAND_LINE;
@@ -291,6 +295,10 @@ int main (int argc, char *argv[])
 		Glib::thread_init();
 	}
 
+#ifdef LXVST_SUPPORT
+	XInitThreads ();
+#endif
+
 #ifdef HAVE_FFTW35F
 	fftwf_make_planner_thread_safe ();
 #endif