diff --git a/panda/src/glxdisplay/glxGraphicsPipe.h b/panda/src/glxdisplay/glxGraphicsPipe.h
index af2ee72aee..173667c509 100644
--- a/panda/src/glxdisplay/glxGraphicsPipe.h
+++ b/panda/src/glxdisplay/glxGraphicsPipe.h
@@ -31,6 +31,7 @@ class glxGraphicsWindow;
 typedef int Display;
 typedef int Window;
 typedef int XErrorEvent;
+typedef int Atom;
 #endif
 
 ////////////////////////////////////////////////////////////////////