diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 3d49a305bf88..17d63c1efdce 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -454,8 +454,7 @@ 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 */
 };