diff --git a/fs/partitions/efi.c b/fs/partitions/efi.c
index 80eeff5..49cfd5f 100644
--- a/fs/partitions/efi.c
+++ b/fs/partitions/efi.c
@@ -262,15 +262,16 @@
 alloc_read_gpt_header(struct block_device *bdev, u64 lba)
 {
 	gpt_header *gpt;
+	unsigned ssz = bdev_logical_block_size(bdev);
+
 	if (!bdev)
 		return NULL;
 
-	gpt = kzalloc(sizeof (gpt_header), GFP_KERNEL);
+	gpt = kzalloc(ssz, GFP_KERNEL);
 	if (!gpt)
 		return NULL;
 
-	if (read_lba(bdev, lba, (u8 *) gpt,
-		     sizeof (gpt_header)) < sizeof (gpt_header)) {
+	if (read_lba(bdev, lba, (u8 *) gpt, ssz) < ssz) {
 		kfree(gpt);
                 gpt=NULL;
 		return NULL;