diff --git a/lib/blob/bdev/blob_bdev.c b/lib/blob/bdev/blob_bdev.c
index 10c91d62f..005447d55 100644
--- a/lib/blob/bdev/blob_bdev.c
+++ b/lib/blob/bdev/blob_bdev.c
@@ -227,7 +227,16 @@ spdk_bdev_create_bs_dev(struct spdk_bdev *bdev, spdk_bdev_remove_cb_t remove_cb,
 	b->bs_dev.readv = bdev_blob_readv;
 	b->bs_dev.writev = bdev_blob_writev;
 	b->bs_dev.write_zeroes = bdev_blob_write_zeroes;
-	b->bs_dev.unmap = bdev_blob_unmap;
+	if (spdk_bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_UNMAP)) {
+		b->bs_dev.unmap = bdev_blob_unmap;
+	} else {
+		/*
+		 * If bdev doesn't support unmap, use write_zeroes as a fallback.
+		 * This will always work, since bdev implements write_zeroes on top of write
+		 * if the device doesn't natively support write_zeroes.
+		 */
+		b->bs_dev.unmap = bdev_blob_write_zeroes;
+	}
 
 	return &b->bs_dev;
 }