diff --git a/tools/testing/src/commonMain/kotlin/org/kotlincrypto/macs/MacUnitTest.kt b/tools/testing/src/commonMain/kotlin/org/kotlincrypto/macs/MacUnitTest.kt
index 73ae402..38e9003 100644
--- a/tools/testing/src/commonMain/kotlin/org/kotlincrypto/macs/MacUnitTest.kt
+++ b/tools/testing/src/commonMain/kotlin/org/kotlincrypto/macs/MacUnitTest.kt
@@ -85,7 +85,7 @@ abstract class MacUnitTest {
         val copy = mac.copy()
         copy.reset()
 
-        assertNotEquals(copy, mac)
+        assertNotEquals(copy.hashCode(), mac.hashCode())
         assertEquals(expectedResetSmallHash, copy.doFinal().encodeToString(TestData.base16))
         assertEquals(expectedUpdateSmallHash, mac.doFinal().encodeToString(TestData.base16))
     }