diff --git a/engine/exception_test.go b/engine/exception_test.go
index 07f2e4e3..9c01c5aa 100644
--- a/engine/exception_test.go
+++ b/engine/exception_test.go
@@ -178,3 +178,7 @@ func TestEvaluationError(t *testing.T) {
 		},
 	}, EvaluationError(ExceptionalValueIntOverflow, nil))
 }
+
+func TestExceptionalValue_Error(t *testing.T) {
+	assert.Equal(t, "int_overflow", ExceptionalValueIntOverflow.Error())
+}