diff --git a/spec/unit/rust-crypto.spec.ts b/spec/unit/rust-crypto.spec.ts
index 81128d9d025..fe98dedbb8a 100644
--- a/spec/unit/rust-crypto.spec.ts
+++ b/spec/unit/rust-crypto.spec.ts
@@ -19,6 +19,7 @@ import { IDBFactory } from "fake-indexeddb";
 
 import { RustCrypto } from "../../src/rust-crypto/rust-crypto";
 import { initRustCrypto } from "../../src/rust-crypto";
+import { IHttpOpts, MatrixHttpApi } from "../../src";
 
 afterEach(() => {
     // reset fake-indexeddb after each test, to make sure we don't leak connections
@@ -34,7 +35,8 @@ describe("RustCrypto", () => {
     let rustCrypto: RustCrypto;
 
     beforeEach(async () => {
-        rustCrypto = (await initRustCrypto(TEST_USER, TEST_DEVICE_ID)) as RustCrypto;
+        const mockHttpApi = {} as MatrixHttpApi<IHttpOpts>;
+        rustCrypto = (await initRustCrypto(mockHttpApi, TEST_USER, TEST_DEVICE_ID)) as RustCrypto;
     });
 
     describe(".exportRoomKeys", () => {
diff --git a/src/client.ts b/src/client.ts
index 3430c008eb2..ae42103f26e 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -2148,7 +2148,7 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
         // importing rust-crypto will download the webassembly, so we delay it until we know it will be
         // needed.
         const RustCrypto = await import("./rust-crypto");
-        this.cryptoBackend = await RustCrypto.initRustCrypto(userId, deviceId);
+        this.cryptoBackend = await RustCrypto.initRustCrypto(this.http, userId, deviceId);
     }
 
     /**
diff --git a/src/rust-crypto/index.ts b/src/rust-crypto/index.ts
index 7485836cdc2..e3b3cb67cd8 100644
--- a/src/rust-crypto/index.ts
+++ b/src/rust-crypto/index.ts
@@ -20,8 +20,13 @@ import { RustCrypto } from "./rust-crypto";
 import { logger } from "../logger";
 import { CryptoBackend } from "../common-crypto/CryptoBackend";
 import { RUST_SDK_STORE_PREFIX } from "./constants";
+import { IHttpOpts, MatrixHttpApi } from "../http-api";
 
-export async function initRustCrypto(userId: string, deviceId: string): Promise<CryptoBackend> {
+export async function initRustCrypto(
+    http: MatrixHttpApi<IHttpOpts>,
+    userId: string,
+    deviceId: string,
+): Promise<CryptoBackend> {
     // initialise the rust matrix-sdk-crypto-js, if it hasn't already been done
     await RustSdkCryptoJs.initAsync();
 
@@ -34,7 +39,7 @@ export async function initRustCrypto(userId: string, deviceId: string): Promise<
 
     // TODO: use the pickle key for the passphrase
     const olmMachine = await RustSdkCryptoJs.OlmMachine.initialize(u, d, RUST_SDK_STORE_PREFIX, "test pass");
-    const rustCrypto = new RustCrypto(olmMachine, userId, deviceId);
+    const rustCrypto = new RustCrypto(olmMachine, http, userId, deviceId);
 
     logger.info("Completed rust crypto-sdk setup");
     return rustCrypto;
diff --git a/src/rust-crypto/rust-crypto.ts b/src/rust-crypto/rust-crypto.ts
index b28b8b858c8..48b5e795108 100644
--- a/src/rust-crypto/rust-crypto.ts
+++ b/src/rust-crypto/rust-crypto.ts
@@ -19,6 +19,7 @@ import * as RustSdkCryptoJs from "@matrix-org/matrix-sdk-crypto-js";
 import type { IEventDecryptionResult, IMegolmSessionData } from "../@types/crypto";
 import { MatrixEvent } from "../models/event";
 import { CryptoBackend, OnSyncCompletedData } from "../common-crypto/CryptoBackend";
+import { IHttpOpts, MatrixHttpApi } from "../http-api";
 
 // import { logger } from "../logger";
 
@@ -32,7 +33,12 @@ export class RustCrypto implements CryptoBackend {
     /** whether stop() has been called */
     private stopped = false;
 
-    public constructor(private readonly olmMachine: RustSdkCryptoJs.OlmMachine, _userId: string, _deviceId: string) {}
+    public constructor(
+        private readonly olmMachine: RustSdkCryptoJs.OlmMachine,
+        private readonly http: MatrixHttpApi<IHttpOpts>,
+        _userId: string,
+        _deviceId: string,
+    ) {}
 
     public stop(): void {
         // stop() may be called multiple times, but attempting to close() the OlmMachine twice