diff --git a/packages/backend/test/e2e/exports.ts b/packages/backend/test/e2e/exports.ts
index 4bcecc9716..1a703b3d36 100644
--- a/packages/backend/test/e2e/exports.ts
+++ b/packages/backend/test/e2e/exports.ts
@@ -16,7 +16,7 @@ describe('export-clips', () => {
 	let bob: misskey.entities.SignupResponse;
 
 	// XXX: Any better way to get the result?
-	async function pollFirstDriveFile() {
+	async function pollFirstDriveFile(): Promise<any> {
 		while (true) {
 			const files = (await api('drive/files', {}, alice)).body;
 			if (!files.length) {
diff --git a/packages/backend/test/e2e/oauth.ts b/packages/backend/test/e2e/oauth.ts
index f639f90ea6..7434701e67 100644
--- a/packages/backend/test/e2e/oauth.ts
+++ b/packages/backend/test/e2e/oauth.ts
@@ -148,7 +148,7 @@ function assertIndirectError(response: Response, error: string): void {
 async function assertDirectError(response: Response, status: number, error: string): Promise<void> {
 	assert.strictEqual(response.status, status);
 
-	const data = await response.json();
+	const data = await response.json() as any;
 	assert.strictEqual(data.error, error);
 }
 
@@ -704,7 +704,7 @@ describe('OAuth', () => {
 		const response = await fetch(new URL('.well-known/oauth-authorization-server', host));
 		assert.strictEqual(response.status, 200);
 
-		const body = await response.json();
+		const body = await response.json() as any;
 		assert.strictEqual(body.issuer, 'http://misskey.local');
 		assert.ok(body.scopes_supported.includes('write:notes'));
 	});