diff --git a/hw/xfree86/i2c/xf86i2c.h b/hw/xfree86/i2c/xf86i2c.h
index edc5f02cf..e4f10f937 100644
--- a/hw/xfree86/i2c/xf86i2c.h
+++ b/hw/xfree86/i2c/xf86i2c.h
@@ -17,7 +17,7 @@ typedef struct _I2CDevRec *I2CDevPtr;
 /* I2C masters have to register themselves */
 
 typedef struct _I2CBusRec {
-    char *BusName;
+    const char *BusName;
     int scrnIndex;
     ScrnInfoPtr pScrn;