diff --git a/panda/src/display/graphicsWindow.h b/panda/src/display/graphicsWindow.h
index 10680e1cd1..fb0eea0f17 100644
--- a/panda/src/display/graphicsWindow.h
+++ b/panda/src/display/graphicsWindow.h
@@ -29,7 +29,7 @@
 #include "buttonEvent.h"
 #include "notify.h"
 #include "pmutex.h"
-#include "remutex.h"
+#include "reMutex.h"
 #include "pvector.h"
 
 ////////////////////////////////////////////////////////////////////