diff --git a/lib/checks/aria/required-children.js b/lib/checks/aria/required-children.js
index 2151908d6e..42239c0e3d 100644
--- a/lib/checks/aria/required-children.js
+++ b/lib/checks/aria/required-children.js
@@ -10,8 +10,8 @@ function owns(node, virtualTree, role, ariaOwned) {
 	if (node === null) {
 		return false;
 	}
-	var implicit = implicitNodes(role),
-		selector = ['[role="' + role + '"]'];
+	const implicit = implicitNodes(role);
+	let selector = ['[role="' + role + '"]'];
 
 	if (implicit) {
 		selector = selector.concat(
@@ -27,14 +27,13 @@ function owns(node, virtualTree, role, ariaOwned) {
 }
 
 function ariaOwns(nodes, role) {
-	var index, length;
-
-	for (index = 0, length = nodes.length; index < length; index++) {
-		if (nodes[index] === null) {
+	for (let index = 0; index < nodes.length; index++) {
+		const node = nodes[index];
+		if (node === null) {
 			continue;
 		}
-		const virtualTree = axe.utils.getNodeFromTree(nodes[index]);
-		if (owns(nodes[index], virtualTree, role, true)) {
+		const virtualTree = axe.utils.getNodeFromTree(node);
+		if (owns(node, virtualTree, role, true)) {
 			return true;
 		}
 	}
@@ -42,13 +41,11 @@ function ariaOwns(nodes, role) {
 }
 
 function missingRequiredChildren(node, childRoles, all, role) {
-	var index,
-		length = childRoles.length,
-		missing = [],
+	const missing = [],
 		ownedElements = idrefs(node, 'aria-owns');
 
-	for (index = 0; index < length; index++) {
-		var childRole = childRoles[index];
+	for (let index = 0; index < childRoles.length; index++) {
+		const childRole = childRoles[index];
 		if (
 			owns(node, virtualNode, childRole) ||
 			ariaOwns(ownedElements, childRole)
@@ -66,8 +63,8 @@ function missingRequiredChildren(node, childRoles, all, role) {
 	// combobox exceptions
 	if (role === 'combobox') {
 		// remove 'textbox' from missing roles if combobox is a native text-type input or owns a 'searchbox'
-		var textboxIndex = missing.indexOf('textbox');
-		var textTypeInputs = ['text', 'search', 'email', 'url', 'tel'];
+		const textboxIndex = missing.indexOf('textbox');
+		const textTypeInputs = ['text', 'search', 'email', 'url', 'tel'];
 		if (
 			(textboxIndex >= 0 &&
 				(node.nodeName.toUpperCase() === 'INPUT' &&
@@ -78,11 +75,25 @@ function missingRequiredChildren(node, childRoles, all, role) {
 			missing.splice(textboxIndex, 1);
 		}
 
-		// remove 'listbox' from missing roles if combobox is collapsed
-		var listboxIndex = missing.indexOf('listbox');
-		var expanded = node.getAttribute('aria-expanded');
-		if (listboxIndex >= 0 && (!expanded || expanded === 'false')) {
-			missing.splice(listboxIndex, 1);
+		const expandedChildRoles = ['listbox', 'tree', 'grid', 'dialog'];
+		const expandedValue = node.getAttribute('aria-expanded');
+		const expanded = expandedValue && expandedValue !== 'false';
+		const popupRole = (
+			node.getAttribute('aria-haspopup') || 'listbox'
+		).toLowerCase();
+
+		for (let index = 0; index < expandedChildRoles.length; index++) {
+			const expandedChildRole = expandedChildRoles[index];
+			// keep the specified popup type required if expanded
+			if (expanded && expandedChildRole === popupRole) {
+				continue;
+			}
+
+			// remove 'listbox' and company from missing roles if combobox is collapsed
+			const missingIndex = missing.indexOf(expandedChildRole);
+			if (missingIndex >= 0) {
+				missing.splice(missingIndex, 1);
+			}
 		}
 	}
 
@@ -108,21 +119,21 @@ function hasDecendantWithRole(node) {
 	);
 }
 
-var role = node.getAttribute('role');
-var required = requiredOwned(role);
+const role = node.getAttribute('role');
+const required = requiredOwned(role);
 
 if (!required) {
 	return true;
 }
 
-var all = false;
-var childRoles = required.one;
+let all = false;
+let childRoles = required.one;
 if (!childRoles) {
-	var all = true;
+	all = true;
 	childRoles = required.all;
 }
 
-var missing = missingRequiredChildren(node, childRoles, all, role);
+const missing = missingRequiredChildren(node, childRoles, all, role);
 
 if (!missing) {
 	return true;
diff --git a/lib/commons/aria/index.js b/lib/commons/aria/index.js
index f0fac21db0..c95eddccf6 100644
--- a/lib/commons/aria/index.js
+++ b/lib/commons/aria/index.js
@@ -433,7 +433,7 @@ lookupTable.role = {
 			required: ['aria-expanded']
 		},
 		owned: {
-			all: ['listbox', 'textbox']
+			all: ['listbox', 'tree', 'grid', 'dialog', 'textbox']
 		},
 		nameFrom: ['author'],
 		context: null,
diff --git a/test/checks/aria/required-children.js b/test/checks/aria/required-children.js
index e447590bd4..a7132dd693 100644
--- a/test/checks/aria/required-children.js
+++ b/test/checks/aria/required-children.js
@@ -206,6 +206,46 @@ describe('aria-required-children', function() {
 		);
 	});
 
+	it('should pass an expanded combobox when the required popup role matches', function() {
+		var params = checkSetup(
+			'<div role="combobox" aria-haspopup="grid" aria-expanded="true" id="target"><p role="textbox">Textbox</p><div role="grid"></div></div>'
+		);
+		assert.isTrue(
+			checks['aria-required-children'].evaluate.apply(checkContext, params)
+		);
+	});
+
+	it('should fail an expanded combobox when the required role is missing on children', function() {
+		var params = checkSetup(
+			'<div role="combobox" aria-haspopup="grid" aria-expanded="true" id="target"><p role="textbox">Textbox</p><div role="listbox"></div></div>'
+		);
+		assert.isFalse(
+			checks['aria-required-children'].evaluate.apply(checkContext, params)
+		);
+
+		assert.deepEqual(checkContext._data, ['grid']);
+	});
+
+	it('should pass an expanded combobox when the required popup role matches regarless of case', function() {
+		var params = checkSetup(
+			'<div role="combobox" aria-haspopup="gRiD" aria-expanded="true" id="target"><p role="textbox">Textbox</p><div role="grid"></div></div>'
+		);
+		assert.isTrue(
+			checks['aria-required-children'].evaluate.apply(checkContext, params)
+		);
+	});
+
+	it('should fail when combobox child isnt default listbox', function() {
+		var params = checkSetup(
+			'<div role="combobox" aria-expanded="true" id="target"><p role="textbox">Textbox</p><div role="grid"></div></div>'
+		);
+		assert.isFalse(
+			checks['aria-required-children'].evaluate.apply(checkContext, params)
+		);
+
+		assert.deepEqual(checkContext._data, ['listbox']);
+	});
+
 	it('should pass one indirectly aria-owned child when one required', function() {
 		var params = checkSetup(
 			'<div role="grid" id="target" aria-owns="r"></div><div id="r"><div role="row">Nothing here.</div></div>'