diff --git a/tests/test-blockjob-txn.c b/tests/test-blockjob-txn.c
index b132e39097b41cd3355e2db0f04930e6bc0f7cfc..f6dfd087461abb10f0b2c5c165b05da21cd57431 100644
--- a/tests/test-blockjob-txn.c
+++ b/tests/test-blockjob-txn.c
@@ -96,7 +96,10 @@ static BlockJob *test_block_job_start(unsigned int iterations,
     char job_id[24];
 
     data = g_new0(TestBlockJobCBData, 1);
-    bs = bdrv_new();
+
+    bs = bdrv_open("null-co://", NULL, NULL, 0, &error_abort);
+    g_assert_nonnull(bs);
+
     snprintf(job_id, sizeof(job_id), "job%u", counter++);
     s = block_job_create(job_id, &test_block_job_driver, bs, 0,
                          BLOCK_JOB_DEFAULT, test_block_job_cb,
@@ -242,6 +245,7 @@ static void test_pair_jobs_fail_cancel_race(void)
 int main(int argc, char **argv)
 {
     qemu_init_main_loop(&error_abort);
+    bdrv_init();
 
     g_test_init(&argc, &argv, NULL);
     g_test_add_func("/single/success", test_single_job_success);
diff --git a/tests/test-blockjob.c b/tests/test-blockjob.c
index 60b78a334272665f088197d10fbcf42ebfed6b72..068c9e419bd31d87974a34cd4a8957ab986292cb 100644
--- a/tests/test-blockjob.c
+++ b/tests/test-blockjob.c
@@ -54,7 +54,10 @@ static BlockJob *do_test_id(BlockBackend *blk, const char *id,
 static BlockBackend *create_blk(const char *name)
 {
     BlockBackend *blk = blk_new();
-    BlockDriverState *bs = bdrv_new();
+    BlockDriverState *bs;
+
+    bs = bdrv_open("null-co://", NULL, NULL, 0, &error_abort);
+    g_assert_nonnull(bs);
 
     blk_insert_bs(blk, bs);
     bdrv_unref(bs);
@@ -140,6 +143,7 @@ static void test_job_ids(void)
 int main(int argc, char **argv)
 {
     qemu_init_main_loop(&error_abort);
+    bdrv_init();
 
     g_test_init(&argc, &argv, NULL);
     g_test_add_func("/blockjob/ids", test_job_ids);