diff --git a/drivers/sk98lin/h/ski2c.h b/drivers/sk98lin/h/ski2c.h
index db2d4e6..5316bba 100644
--- a/drivers/sk98lin/h/ski2c.h
+++ b/drivers/sk98lin/h/ski2c.h
@@ -161,6 +161,8 @@
 /*
  * Define READ and WRITE Constants.
  */
+#undef	I2C_READ		/* just in case */
+#undef	I2C_WRITE		/* just in case */
 #define I2C_READ	0
 #define I2C_WRITE	1
 #define I2C_BURST	1