diff --git a/src/util/util.ts b/src/util/util.ts
index 8b103e3..7c765a4 100644
--- a/src/util/util.ts
+++ b/src/util/util.ts
@@ -179,9 +179,9 @@ function deepCopy(obj: Array<any> | any): any {
 
 function customIn(a: number | string, b: number | string): number {
   if ((b as any) instanceof Array) {
-    return (((b as any) as Array<any>).includes(a) as unknown) as number;
+    return (b as any as Array<any>).includes(a) as unknown as number;
   }
-  return ((a in (b as any)) as unknown) as number;
+  return (a in (b as any)) as unknown as number;
 }
 
 function bracketCompatible(exp: string): string {
diff --git a/test/enforcer.test.ts b/test/enforcer.test.ts
index a09c863..86642d3 100644
--- a/test/enforcer.test.ts
+++ b/test/enforcer.test.ts
@@ -597,9 +597,9 @@ test('test ABAC multiple eval()', async () => {
   );
 
   const e = await newEnforcer(m, policy);
-  await testEnforce(e, 56, (98 as unknown) as string, 'read', true);
-  await testEnforce(e, 23, (67 as unknown) as string, 'read', false);
-  await testEnforce(e, 78, (34 as unknown) as string, 'read', false);
+  await testEnforce(e, 56, 98 as unknown as string, 'read', true);
+  await testEnforce(e, 23, 67 as unknown as string, 'read', false);
+  await testEnforce(e, 78, 34 as unknown as string, 'read', false);
 });
 
 // https://github.com/casbin/node-casbin/issues/438
@@ -617,10 +617,10 @@ test('test ABAC single eval() with r. in unexpected places', async () => {
   );
 
   const e = await newEnforcer(m, policy);
-  await testEnforce(e, { id: 3 }, ({ owner: { id: 3 } } as unknown) as string, 'read', true);
-  await testEnforce(e, {}, ({ owner: {} } as unknown) as string, 'read', false);
-  await testEnforce(e, { id: 3 }, ({ owner: {} } as unknown) as string, 'read', false);
-  await testEnforce(e, { id: 3 }, ({ owner: { id: 2 } } as unknown) as string, 'read', false);
+  await testEnforce(e, { id: 3 }, { owner: { id: 3 } } as unknown as string, 'read', true);
+  await testEnforce(e, {}, { owner: {} } as unknown as string, 'read', false);
+  await testEnforce(e, { id: 3 }, { owner: {} } as unknown as string, 'read', false);
+  await testEnforce(e, { id: 3 }, { owner: { id: 2 } } as unknown as string, 'read', false);
 });
 
 test('TestEnforceSync', async () => {