diff --git a/vpnor/test/write_patch.cpp b/vpnor/test/write_patch.cpp
index 4f59db5..4a200c0 100644
--- a/vpnor/test/write_patch.cpp
+++ b/vpnor/test/write_patch.cpp
@@ -57,7 +57,7 @@
 
     /* Test */
     memset(src, 0x33, sizeof(src));
-    rc = flash_write(ctx, 0x1000, src, sizeof(src));
+    rc = backend_write(&ctx->backend, 0x1000, src, sizeof(src));
     assert(rc == 0);
 
     /* Check that RW file is unmodified after the patch write */
diff --git a/vpnor/test/write_patch_resize.cpp b/vpnor/test/write_patch_resize.cpp
index ce128c8..38effd6 100644
--- a/vpnor/test/write_patch_resize.cpp
+++ b/vpnor/test/write_patch_resize.cpp
@@ -56,7 +56,7 @@
 
     /* Test */
     std::vector<uint8_t> update(UPDATE_SIZE, 0x55);
-    rc = flash_write(ctx, 0x1000, update.data(), update.size());
+    rc = backend_write(&ctx->backend, 0x1000, update.data(), update.size());
     assert(rc == 0);
 
     /* Check that PATCH is modified with the new data */
diff --git a/vpnor/test/write_prsv.cpp b/vpnor/test/write_prsv.cpp
index 9ee1fb3..134a98e 100644
--- a/vpnor/test/write_prsv.cpp
+++ b/vpnor/test/write_prsv.cpp
@@ -46,7 +46,7 @@
 
     /* Test */
     memset(src, 0xaa, sizeof(src));
-    rc = flash_write(ctx, 0x1000, src, sizeof(src));
+    rc = backend_write(&ctx->backend, 0x1000, src, sizeof(src));
     assert(rc == 0);
 
     /* Verify */
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);
diff --git a/vpnor/test/write_rw.cpp b/vpnor/test/write_rw.cpp
index 3b742a1..cf9bf7b 100644
--- a/vpnor/test/write_rw.cpp
+++ b/vpnor/test/write_rw.cpp
@@ -48,7 +48,7 @@
 
     /* Test */
     memset(src, 0xbb, sizeof(src));
-    rc = flash_write(ctx, 0x1000, src, sizeof(src));
+    rc = backend_write(&ctx->backend, 0x1000, src, sizeof(src));
     assert(rc == 0);
     fd = open((root.rw() / "TEST1").c_str(), O_RDONLY);
     map = mmap(NULL, sizeof(src), PROT_READ, MAP_SHARED, fd, 0);
@@ -58,31 +58,31 @@
 
     /* Ensure single byte writes function */
     memset(src, 0xcc, sizeof(src));
-    rc = flash_write(ctx, 0x1000, src, sizeof(src));
+    rc = backend_write(&ctx->backend, 0x1000, src, sizeof(src));
     assert(rc == 0);
     rc = memcmp(src, map, sizeof(src));
     assert(rc == 0);
 
     src[0] = 0xff;
-    rc = flash_write(ctx, 0x1000, src, 1);
+    rc = backend_write(&ctx->backend, 0x1000, src, 1);
     assert(rc == 0);
     rc = memcmp(src, map, sizeof(src));
     assert(rc == 0);
 
     src[1] = 0xff;
-    rc = flash_write(ctx, 0x1000 + 1, &src[1], 1);
+    rc = backend_write(&ctx->backend, 0x1000 + 1, &src[1], 1);
     assert(rc == 0);
     rc = memcmp(src, map, sizeof(src));
     assert(rc == 0);
 
     src[2] = 0xff;
-    rc = flash_write(ctx, 0x1000 + 2, &src[2], 1);
+    rc = backend_write(&ctx->backend, 0x1000 + 2, &src[2], 1);
     assert(rc == 0);
     rc = memcmp(src, map, sizeof(src));
     assert(rc == 0);
 
     /* Writes past the end of the partition should fail */
-    rc = flash_write(ctx, 0x1000 + 0xff9, src, sizeof(src));
+    rc = backend_write(&ctx->backend, 0x1000 + 0xff9, src, sizeof(src));
     assert(rc < 0);
 
     /* Check that RW file is unmodified after the bad write */