diff --git a/test/test.ts b/test/test.ts
index e78ad48..7508258 100644
--- a/test/test.ts
+++ b/test/test.ts
@@ -36,4 +36,12 @@ tap.test('should be greater than', async () => {
   smartexpect.expect(4).toBeLessThan(5);
 })
 
+tap.test('should correctly determine toContain', async () => {
+  const hello = {
+    socool: 'yes'
+  };
+  const testArray = [hello];
+  smartexpect.expect(testArray).toContain(hello);
+})
+
 tap.start();
diff --git a/ts/smartexpect.classes.assertion.ts b/ts/smartexpect.classes.assertion.ts
index aab833e..2369ff2 100644
--- a/ts/smartexpect.classes.assertion.ts
+++ b/ts/smartexpect.classes.assertion.ts
@@ -189,9 +189,7 @@ export class Assertion {
     return this.runCheck(() => {
       const result =
         this.baseReference instanceof Array &&
-        this.baseReference.find((itemArg2) => {
-          itemArg === itemArg2;
-        });
+        this.baseReference.includes(itemArg);
       if (!result) {
         throw new Error(`${this.baseReference} is not contain ${itemArg}`);
       }