diff --git a/src/i830.h b/src/i830.h
index b962e88c..27a9817b 100644
--- a/src/i830.h
+++ b/src/i830.h
@@ -724,4 +724,12 @@ void i830_tv_init(ScrnInfoPtr pScrn);
 #define _845_DRAM_RW_CONTROL 0x90
 #define DRAM_WRITE    0x33330000
 
+/* Compat definitions for older X Servers. */
+#ifndef M_T_PREFERRED
+#define M_T_PREFERRED	0x08
+#endif
+#ifndef M_T_DRIVER
+#define M_T_DRIVER	0x40
+#endif
+
 #endif /* _I830_H_ */