diff --git a/packages/backend/test/e2e/fetch-validate-ap-deny.ts b/packages/backend/test/e2e/fetch-validate-ap-deny.ts
index 434a9fe209..9a09975fcd 100644
--- a/packages/backend/test/e2e/fetch-validate-ap-deny.ts
+++ b/packages/backend/test/e2e/fetch-validate-ap-deny.ts
@@ -25,7 +25,7 @@ describe('validateContentTypeSetAsActivityPub/JsonLD (deny case)', () => {
 			validateContentTypeSetAsActivityPub(res);
 		}
 
-		expect(doValidate).toThrow('Content type is not');
+		expect(doValidate).toThrow('content type is not');
 	});
 
 	test('JSON-LD: ファイルはエラーになる', async () => {
@@ -35,6 +35,6 @@ describe('validateContentTypeSetAsActivityPub/JsonLD (deny case)', () => {
 			validateContentTypeSetAsJsonLD(res);
 		}
 
-		expect(doValidate).toThrow('Content type is not');
+		expect(doValidate).toThrow('content type is not');
 	});
 });