diff --git a/lib/bitlk/bitlk.c b/lib/bitlk/bitlk.c
index aa8fa0ce..a21283c2 100644
--- a/lib/bitlk/bitlk.c
+++ b/lib/bitlk/bitlk.c
@@ -1003,7 +1003,7 @@ int BITLK_activate(struct crypt_device *cd,
 	}
 
 	r = device_block_adjust(cd, crypt_data_device(cd), DEV_EXCL,
-				crypt_get_data_offset(cd), &dmd.size, &dmd.flags);
+				0, &dmd.size, &dmd.flags);
 	if (r) {
 		crypt_free_volume_key(open_fvek_key);
 		return r;
diff --git a/lib/setup.c b/lib/setup.c
index 018b62a4..7aaf5de0 100644
--- a/lib/setup.c
+++ b/lib/setup.c
@@ -5266,6 +5266,9 @@ uint64_t crypt_get_data_offset(struct crypt_device *cd)
 	if (isTCRYPT(cd->type))
 		return TCRYPT_get_data_offset(cd, &cd->u.tcrypt.hdr, &cd->u.tcrypt.params);
 
+	if (isBITLK(cd->type))
+		return cd->u.bitlk.params.volume_header_size / SECTOR_SIZE;
+
 	return cd->data_offset;
 }