diff --git a/src/lib/util/assertString.js b/src/lib/util/assertString.js
index 3baa4452f..e62e1a624 100644
--- a/src/lib/util/assertString.js
+++ b/src/lib/util/assertString.js
@@ -1,4 +1,4 @@
 export default function assertString(input) {
   if (input === undefined || input === null) throw new TypeError(`Expected a string but received a ${input}`);
-  if (input.constructor.name !== 'String') throw new TypeError(`Expected a string but received a ${input.constructor.name}`);
+  if (typeof input !== 'string' && !(input instanceof String)) throw new TypeError(`Expected a string but received a ${input?.constructor?.name ?? typeof input}`)
 }
diff --git a/test/util.test.js b/test/util.test.js
index 0146a4e2c..5edbf0441 100644
--- a/test/util.test.js
+++ b/test/util.test.js
@@ -54,11 +54,23 @@ describe('assertString', () => {
     assert.throws(() => { assertString([]); }, TypeError);
   });
 
+  it('Should throw an error if argument provided is an Object pretending to be a \'string\'', () => {
+    assert.throws(() => { assertString({constructor: {name: "string"}}); }, TypeError);
+  });
+
+  it('Should throw an error if argument provided is an Object pretending to be a \'String\'', () => {
+    assert.throws(() => { assertString({constructor: {name: "String"}}); }, TypeError);
+  });
+
   it('Should not throw an error if the argument is an empty string', () => {
     assert.doesNotThrow(() => { assertString(''); });
   });
-
+  
   it('Should not throw an error if the argument is a String', () => {
     assert.doesNotThrow(() => { assertString('antidisestablishmentarianism'); });
   });
+
+  it('Should not throw an error if the argument is a boxed string', () => {
+    assert.doesNotThrow(() => { assertString(new String('antidisestablishmentarianism')); });
+  });
 });