diff --git a/lib/checks/aria/allowed-attr.js b/lib/checks/aria/allowed-attr.js
index bcc8a4d5c6..63d889c5f3 100644
--- a/lib/checks/aria/allowed-attr.js
+++ b/lib/checks/aria/allowed-attr.js
@@ -12,12 +12,8 @@ if (!role) {
 
 allowed = axe.commons.aria.allowedAttr(role);
 
-if (Object.keys(options).length) {
-	for (var roleOption in options) {
-		if (roleOption === role) {
-			allowed = axe.utils.uniqueArray(options[role].concat(allowed));
-		}
-	}
+if (Array.isArray(options[role])) {
+  allowed = axe.utils.uniqueArray(options[role].concat(allowed));
 }
 
 if (role && allowed) {
diff --git a/lib/checks/aria/required-attr.js b/lib/checks/aria/required-attr.js
index 832589c329..74bce8d9ff 100644
--- a/lib/checks/aria/required-attr.js
+++ b/lib/checks/aria/required-attr.js
@@ -7,12 +7,8 @@ if (node.hasAttributes()) {
 		role = node.getAttribute('role'),
 		required = axe.commons.aria.requiredAttr(role);
 
-	if (Object.keys(options).length) {
-		for (var roleOption in options) {
-			if (roleOption === role) {
-				required = axe.utils.uniqueArray(options[role].concat(required));
-			}
-		}
+	if (Array.isArray(options[role])) {
+	  required = axe.utils.uniqueArray(options[role], required);
 	}
 	if (role && required) {
 		for (var i = 0, l = required.length; i < l; i++) {
diff --git a/lib/core/utils/to-array.js b/lib/core/utils/to-array.js
index ecce937fd0..394972cd88 100644
--- a/lib/core/utils/to-array.js
+++ b/lib/core/utils/to-array.js
@@ -11,12 +11,13 @@ axe.utils.toArray = function (thing) {
 
 
 /**
- * Creates an array without duplicate values
- * @param  {Array} arrArg Array to filter
+ * Creates an array without duplicate values from 2 array inputs
+ * @param  {Array} arr1 First array
+ * @param  {Array} arr2 Second array
  * @return {Array}
  */
-axe.utils.uniqueArray = (arrArg) => {
-  return arrArg.filter((elem, pos, arr) => {
+axe.utils.uniqueArray = (arr1, arr2) => {
+  return arr1.concat(arr2).filter((elem, pos, arr) => {
     return arr.indexOf(elem) === pos;
   });
 };
diff --git a/test/core/utils/to-array.js b/test/core/utils/to-array.js
index 630d723bd8..133d432a8e 100644
--- a/test/core/utils/to-array.js
+++ b/test/core/utils/to-array.js
@@ -33,7 +33,7 @@ describe('axe.utils.uniqueArray', function () {
 		var array1 = [1, 2, 3, 4, 5];
 		var array2 = [1, 3, 7];
 
-		var result = axe.utils.uniqueArray(array1.concat(array2));
+		var result = axe.utils.uniqueArray(array1, array2);
 		assert.isArray(result);
 		assert.includeMembers(result, [1, 2, 3, 4, 5, 7]);
 	});