diff --git a/LESS.sublime-syntax b/LESS.sublime-syntax
index fbb0b26..8e5e711 100644
--- a/LESS.sublime-syntax
+++ b/LESS.sublime-syntax
@@ -464,8 +464,12 @@ contexts:
           pop: true
         - match: '\('
           scope: meta.group.css punctuation.section.group.begin.css
-        - match: '[0-9]+'
+        - match: '[+-]'
+          scope: keyword.operator.css
+        - match: '[0-9]+(n*)'
           scope: meta.group.css constant.numeric.css
+          captures:
+            1: keyword.other.unit.css
     - match: (:|::)(selection|first-line|first-letter|before|backdrop|after)\b
       scope: meta.selector.css entity.other.pseudo-element.css
       captures:
diff --git a/syntax_test_less.less b/syntax_test_less.less
index 0114570..04474ea 100755
--- a/syntax_test_less.less
+++ b/syntax_test_less.less
@@ -228,6 +228,9 @@ html::before {
 .avatar:not(.class) {}
 /*               ^ meta.group.css entity.other.attribute-name.class.css */
 /*                ^ meta.group.css punctuation.section.group.end.css */
+.class#id:nth-child(2n-1) {}
+/*                   ^ constant.numeric.css keyword.other.unit.css */
+/*                    ^ keyword.operator.css */
 .avatar:nth-child(3) {
 /*     ^ entity.other.pseudo-class.css punctuation.definition.entity.css */
 /*.     ^ entity.other.pseudo-class.css */