diff --git a/zipl/boot/eckd2.c b/zipl/boot/eckd2.c
index 7ac6da21..8062db67 100644
--- a/zipl/boot/eckd2.c
+++ b/zipl/boot/eckd2.c
@@ -30,7 +30,7 @@ int is_zero_block(void *data)
 void * load_direct(disk_blockptr_t *data, struct subchannel_id subchannel_id,
 	    void *load_addr)
 {
-	struct eckd_blockptr *blockptr = (struct eckd_blockptr *)data;
+	struct eckd_blockptr *blockptr = &data->eckd;
 	struct ccw1 *ccws;
 	unsigned long record_size;
 	struct seek_arg seek_addr;
diff --git a/zipl/boot/fba2.c b/zipl/boot/fba2.c
index 1a570c21..7842b57c 100644
--- a/zipl/boot/fba2.c
+++ b/zipl/boot/fba2.c
@@ -28,7 +28,7 @@ int is_zero_block(void *data) {
 void *load_direct(disk_blockptr_t *data, struct subchannel_id subchannel_id,
 	    void *load_addr)
 {
-	struct linear_blockptr *blockptr = (struct linear_blockptr *)data;
+	struct linear_blockptr *blockptr = &data->linear;
 	struct DE_fba_data *de_data;
 	struct LO_fba_data *lo_data;
 	struct ccw1 *ccws;