diff --git a/packages/less/src/less/parser/parser.js b/packages/less/src/less/parser/parser.js
index b87b4d762..9c6e50e2e 100644
--- a/packages/less/src/less/parser/parser.js
+++ b/packages/less/src/less/parser/parser.js
@@ -5,7 +5,6 @@ import getParserInput from './parser-input';
 import * as utils from '../utils';
 import functionRegistry from '../functions/function-registry';
 import { ContainerSyntaxOptions, MediaSyntaxOptions } from '../tree/atrule-syntax';
-import Selector from '../tree/selector';
 import Anonymous from '../tree/anonymous';
 
 //
@@ -1314,27 +1313,25 @@ const Parser = function Parser(context, imports, fileInfo, currentIndex) {
                 if (!e) {
                     parserInput.save();
                     if (parserInput.$char('(')) {
-                        if ((v = this.selector(false))) {
-                            let selectors = [];
-                            while (parserInput.$char(',')) {
-                                selectors.push(v);
-                                selectors.push(new Anonymous(','));
-                                v = this.selector(false);
-                            }
-                            selectors.push(v);
-                                                        
+                        let vSelectors = [];
+                        while ((v = this.selector(false)) && parserInput.$char(',')) {
+                            vSelectors.push(v);
+                            vSelectors.push(new Anonymous(','));
+                        }
+                        vSelectors.push(v);
+
+                        if (v) {
                             if (parserInput.$char(')')) {
-                                if (selectors.length > 1) {
-                                    e = new (tree.Paren)(new Selector(selectors));
+                                if (vSelectors.length === 1) {
+                                    e = new (tree.Paren)(vSelectors[0]);
                                 } else {
-                                    e = new(tree.Paren)(v);
+                                    e = new (tree.ListParen)(vSelectors);
                                 }
-                                parserInput.forget();
                             } else {
                                 parserInput.restore('Missing closing \')\'');
                             }
                         } else {
-                            parserInput.restore('Missing closing \')\'');
+                            parserInput.restore('Could not find valid selector');
                         }
                     } else {
                         parserInput.forget();
diff --git a/packages/less/src/less/tree/index.js b/packages/less/src/less/tree/index.js
index 1d4fbfdd7..74b89d6da 100644
--- a/packages/less/src/less/tree/index.js
+++ b/packages/less/src/less/tree/index.js
@@ -38,6 +38,7 @@ import NamespaceValue from './namespace-value';
 // mixins
 import MixinCall from './mixin-call';
 import MixinDefinition from './mixin-definition';
+import ListParen from './list-paren';
 
 export default {
     Node, Color, AtRule, DetachedRuleset, Operation,
@@ -47,7 +48,7 @@ export default {
     Comment, Anonymous, Value, JavaScript, Assignment,
     Condition, Paren, Media, Container, QueryInParens, 
     UnicodeDescriptor, Negative, Extend, VariableCall, 
-    NamespaceValue,
+    NamespaceValue, ListParen,
     mixin: {
         Call: MixinCall,
         Definition: MixinDefinition
diff --git a/packages/less/src/less/tree/list-paren.js b/packages/less/src/less/tree/list-paren.js
new file mode 100644
index 000000000..5600cc3ef
--- /dev/null
+++ b/packages/less/src/less/tree/list-paren.js
@@ -0,0 +1,21 @@
+import Node from './node';
+
+const ListParen = function(node) {
+    this.value = node;
+};
+
+ListParen.prototype = Object.assign(new Node(), {
+    type: 'ListParen',
+
+    genCSS(context, output) {
+        output.add('(');
+        this.value.forEach(val => val.genCSS(context, output));
+        output.add(')');
+    },
+
+    eval(context) {
+        return new ListParen(this.value.map(val => val.eval(context)));
+    }
+});
+
+export default ListParen;
diff --git a/packages/test-data/css/_main/selectors.css b/packages/test-data/css/_main/selectors.css
index 92c8b824f..164abfb48 100644
--- a/packages/test-data/css/_main/selectors.css
+++ b/packages/test-data/css/_main/selectors.css
@@ -189,3 +189,24 @@ a:is(.b, :is(.c)) {
 a:is(.b, :is(.c), :has(div)) {
   color: red;
 }
+@-moz-document domain("example.com") {
+  :is(
+    [a1],
+    [a2]
+  ):is( [a3], [a4]:not( :is([a5],[a6])):is( [a7]:not(:is([a8],[a9])), [b1]:not(:is([b2],[b3]))):is(
+      [b4],[b5]
+    ), [b6], [b7]) {
+    color: red;
+  }
+}
+@-moz-document domain("example.com") {
+  :is([foo], [bar], [baz]) {
+    color: red;
+  }
+}
+:is(.color-1, .focus-color-1:focus, .hover-color-1:hover) {
+  color: red !important;
+}
+:is(.color-2, .focus-color-2:focus, .hover-color-2:hover) {
+  color: green !important;
+}
diff --git a/packages/test-data/less/_main/selectors.less b/packages/test-data/less/_main/selectors.less
index c976380a8..055cdb1b2 100644
--- a/packages/test-data/less/_main/selectors.less
+++ b/packages/test-data/less/_main/selectors.less
@@ -208,3 +208,39 @@ a:is(.b, :is(.c)) {
 a:is(.b, :is(.c), :has(div)) {
   color: red;
 }
+
+@-moz-document domain("example.com") {
+  :is(
+    [a1],
+    [a2]
+  ):is(
+    [a3],
+    [a4]:not(
+      :is([a5],[a6])
+    ):is(
+      [a7]:not(:is([a8],[a9])),
+      [b1]:not(:is([b2],[b3]))
+    ):is(
+      [b4],[b5]
+    ),
+    [b6],
+    [b7]
+  ) {
+    color: red; }
+
+}
+
+@-moz-document domain("example.com") {
+	:is([foo], [bar] /* :is(a, b) */, [baz]) {
+		color: red; }
+}
+
+@color: red green;
+
+each(@color, {
+  :is(.color-@{key},
+  .focus-color-@{key}:focus,
+  .hover-color-@{key}:hover) {
+    color: @value !important;
+  }
+});