diff --git a/panda/src/glxdisplay/glxGraphicsPipe.cxx b/panda/src/glxdisplay/glxGraphicsPipe.cxx
index 5cfbe34672..5eb42b1752 100644
--- a/panda/src/glxdisplay/glxGraphicsPipe.cxx
+++ b/panda/src/glxdisplay/glxGraphicsPipe.cxx
@@ -25,7 +25,7 @@ bool glxGraphicsPipe::_error_handlers_installed = false;
 glxGraphicsPipe::ErrorHandlerFunc *glxGraphicsPipe::_prev_error_handler;
 glxGraphicsPipe::IOErrorHandlerFunc *glxGraphicsPipe::_prev_io_error_handler;
 
-ReMutex glxGraphicsPipe::_x_mutex;
+LightReMutex glxGraphicsPipe::_x_mutex;
 
 ////////////////////////////////////////////////////////////////////
 //     Function: glxGraphicsPipe::Constructor