diff --git a/src/mesa/drivers/dri/mach64/mach64_ioctl.c b/src/mesa/drivers/dri/mach64/mach64_ioctl.c
index 0bd09391666..4c391fec246 100644
--- a/src/mesa/drivers/dri/mach64/mach64_ioctl.c
+++ b/src/mesa/drivers/dri/mach64/mach64_ioctl.c
@@ -28,6 +28,7 @@
  *	Leif Delgass <ldelgass@retinalburn.net>
  *	José Fonseca <j_r_fonseca@yahoo.co.uk>
  */
+#include <errno.h>
 
 #include "mach64_context.h"
 #include "mach64_state.h"