diff --git a/vpnor/test/write_ro.cpp b/vpnor/test/write_ro.cpp
index e6bedd3..5965ebf 100644
--- a/vpnor/test/write_ro.cpp
+++ b/vpnor/test/write_ro.cpp
@@ -43,7 +43,7 @@
     test::VpnorRoot root(&ctx->backend, toc, BLOCK_SIZE);
 
     /* Test */
-    rc = flash_write(ctx, 0x1000, src, sizeof(src));
+    rc = backend_write(&ctx->backend, 0x1000, src, sizeof(src));
 
     /* Verify we can't write to RO partitions */
     assert(rc != 0);