diff --git a/glx/glxserver.h b/glx/glxserver.h
index 891315b74d..6bcf7d3a70 100644
--- a/glx/glxserver.h
+++ b/glx/glxserver.h
@@ -46,12 +46,6 @@
 #include <resource.h>
 #include <scrnintstr.h>
 
-/*
-** The X header misc.h defines these math functions.
-*/
-#undef abs
-#undef fabs
-
 #define GL_GLEXT_PROTOTYPES /* we want prototypes */
 #include <GL/gl.h>
 #include <GL/glxproto.h>
diff --git a/hw/dmx/glxProxy/glxserver.h b/hw/dmx/glxProxy/glxserver.h
index cd833f8530..03e95b865e 100644
--- a/hw/dmx/glxProxy/glxserver.h
+++ b/hw/dmx/glxProxy/glxserver.h
@@ -42,12 +42,6 @@
 #include <scrnintstr.h>
 
 
-/*
-** The X header misc.h defines these math functions.
-*/
-#undef abs
-#undef fabs
-
 #define GL_GLEXT_PROTOTYPES /* we want prototypes */
 #include <GL/gl.h>
 #include <GL/glxproto.h>