diff --git a/barretenberg/ts/src/barretenberg/backend.ts b/barretenberg/ts/src/barretenberg/backend.ts
index df541aa7de3..546b6738f6b 100644
--- a/barretenberg/ts/src/barretenberg/backend.ts
+++ b/barretenberg/ts/src/barretenberg/backend.ts
@@ -255,7 +255,7 @@ export class UltraHonkBackend {
     await this.instantiate();
     const vkBuf =
       vk ?? (await this.api.acirWriteVkUltraHonk(this.acirUncompressedBytecode, this.circuitOptions.recursive));
-    return await this.api.acirHonkSolidityVerifier(this.acirUncompressedBytecode, vkBuf);
+    return await this.api.acirHonkSolidityVerifier(this.acirUncompressedBytecode, new RawBuffer(vkBuf));
   }
 
   // TODO(https://github.com/noir-lang/noir/issues/5661): Update this to handle Honk recursive aggregation in the browser once it is ready in the backend itself