diff --git a/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c
index 97c6e3ffd9..bc5cda4292 100644
--- a/fs/ext4/ext4_common.c
+++ b/fs/ext4/ext4_common.c
@@ -1423,7 +1423,7 @@ static struct ext4_extent_header *ext4fs_get_extent_block
 {
 	struct ext4_extent_idx *index;
 	unsigned long long block;
-	struct ext_filesystem *fs = get_fs();
+	int blksz = EXT2_BLOCK_SIZE(data);
 	int i;
 
 	while (1) {
@@ -1447,7 +1447,7 @@ static struct ext4_extent_header *ext4fs_get_extent_block
 		block = le32_to_cpu(index[i].ei_leaf_hi);
 		block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
 
-		if (ext4fs_devread(block << log2_blksz, 0, fs->blksz, buf))
+		if (ext4fs_devread(block << log2_blksz, 0, blksz, buf))
 			ext_block = (struct ext4_extent_header *)buf;
 		else
 			return 0;