diff --git a/test/lib/blobfs/cache_ut/cache_ut.c b/test/lib/blobfs/cache_ut/cache_ut.c
index 0ebbedcd9..277139fd9 100644
--- a/test/lib/blobfs/cache_ut/cache_ut.c
+++ b/test/lib/blobfs/cache_ut/cache_ut.c
@@ -192,6 +192,7 @@ cache_append_no_cache(void)
 	CU_ASSERT(spdk_file_get_length(g_file) == 1 * sizeof(buf));
 	spdk_file_write(g_file, channel, buf, 1 * sizeof(buf), sizeof(buf));
 	CU_ASSERT(spdk_file_get_length(g_file) == 2 * sizeof(buf));
+	spdk_file_sync(g_file, channel);
 	cache_free_buffers(g_file);
 	spdk_file_write(g_file, channel, buf, 2 * sizeof(buf), sizeof(buf));
 	CU_ASSERT(spdk_file_get_length(g_file) == 3 * sizeof(buf));