diff --git a/test/units.js b/test/units.js
index 3759e2c..e93a71b 100644
--- a/test/units.js
+++ b/test/units.js
@@ -26,13 +26,20 @@ describe('Units:', () => {
       expect(actual).to.be.equal(expected);
     });
   it(
-    'should fail with wrong input', () => {
+    'should pass even if options are not passed', () => {
       const res = {
         statusCode: 503,
         body: {
           key: 'value'
         }
       };
-      expect(() => {generateErrorMessage(res)}).to.throw('options object missing');
+
+      const actual = generateErrorMessage(res);
+      const expected =
+        `Unexpected status code: 503, Body: { key: \'value\' }, Options: undefined`;
+
+      expect(actual).to.be.equal(expected);
     });
+
+  it.only('should fail without response object', () => { expect(() => {generateErrorMessage()}).to.throw('response object missing'); });
 });
diff --git a/units.js b/units.js
index 39723b3..c9bc5d4 100644
--- a/units.js
+++ b/units.js
@@ -12,9 +12,6 @@ const generateErrorMessage = (res, options) => {
   if (!is(Object, res)) {
     throw new Error('response object missing')
   }
-  if (!is(Object, options)) {
-    throw new Error('options object missing')
-  }
   return `${`Unexpected status code: ${res.statusCode}, Body: ${util.inspect(res.body, { depth: 4 })}, Options: `}${util.inspect(options, { depth: 4 })}`
 }
 
diff --git a/yarn.lock b/yarn.lock
index 1f19307..aaac973 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1618,7 +1618,7 @@ verror@1.10.0:
     core-util-is "1.0.2"
     extsprintf "^1.2.0"
 
-"vm2@github:patriksimek/vm2#custom_files":
+vm2@patriksimek/vm2#custom_files:
   version "3.5.0"
   resolved "https://codeload.github.com/patriksimek/vm2/tar.gz/7e82f90ac705fc44fad044147cb0df09b4c79a57"