diff --git a/kernel/include/i2c-dev.h b/kernel/include/i2c-dev.h
index 1e25555a..3657001b 100644
--- a/kernel/include/i2c-dev.h
+++ b/kernel/include/i2c-dev.h
@@ -118,8 +118,7 @@ struct i2c_msg {
 union i2c_smbus_data {
 	__u8 byte;
 	__u16 word;
-	__u8 block[I2C_SMBUS_BLOCK_MAX + 3]; /* block[0] is used for length */
-                          /* one more for read length in block process call */
+	__u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
 	                                            /* and one more for PEC */
 };