diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 2460356..fe2a3a3 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -422,7 +422,7 @@
 	unsigned long		flags;
 	struct mlx4_caps	caps;
 	struct radix_tree_root	qp_table_tree;
-	u32			rev_id;
+	u8			rev_id;
 	char			board_id[MLX4_BOARD_ID_LEN];
 };