diff --git a/hw/xfree86/i2c/xf86i2c.c b/hw/xfree86/i2c/xf86i2c.c
index e1e06e19e5..c70aaf1ac4 100644
--- a/hw/xfree86/i2c/xf86i2c.c
+++ b/hw/xfree86/i2c/xf86i2c.c
@@ -769,7 +769,7 @@ xf86I2CBusInit(I2CBusPtr b)
 }
 
 I2CBusPtr
-xf86I2CFindBus(int scrnIndex, char *name)
+xf86I2CFindBus(int scrnIndex, const char *name)
 {
     I2CBusPtr p;
 
diff --git a/hw/xfree86/i2c/xf86i2c.h b/hw/xfree86/i2c/xf86i2c.h
index 7a9b12f309..edc5f02cfc 100644
--- a/hw/xfree86/i2c/xf86i2c.h
+++ b/hw/xfree86/i2c/xf86i2c.h
@@ -59,7 +59,7 @@ extern _X_EXPORT void xf86DestroyI2CBusRec(I2CBusPtr pI2CBus, Bool unalloc,
 #define I2CBusInit		xf86I2CBusInit
 extern _X_EXPORT Bool xf86I2CBusInit(I2CBusPtr pI2CBus);
 
-extern _X_EXPORT I2CBusPtr xf86I2CFindBus(int scrnIndex, char *name);
+extern _X_EXPORT I2CBusPtr xf86I2CFindBus(int scrnIndex, const char *name);
 extern _X_EXPORT int xf86I2CGetScreenBuses(int scrnIndex,
                                            I2CBusPtr ** pppI2CBus);