diff --git a/src/method-call-validator/parameter-validation-error.test.ts b/src/method-call-validator/parameter-validation-error.test.ts
index a1195d79..5738eec5 100644
--- a/src/method-call-validator/parameter-validation-error.test.ts
+++ b/src/method-call-validator/parameter-validation-error.test.ts
@@ -13,4 +13,9 @@ describe("ParameterValidationError", () => {
     const error = new ParameterValidationError(1, { type: "number" }, "hey mom", [errorObj]);
     expect(error).toBeInstanceOf(ParameterValidationError);
   });
+
+  it("works when passed an object key instead of array index", () => {
+    const error = new ParameterValidationError("foo", { type: "number" }, "hey mom", [errorObj]);
+    expect(error).toBeInstanceOf(ParameterValidationError);
+  });
 });