diff --git a/lib/nodes/Func.js b/lib/nodes/Func.js
index 6c4fd37..663fa6e 100644
--- a/lib/nodes/Func.js
+++ b/lib/nodes/Func.js
@@ -87,7 +87,7 @@ const cssFunctions = [
 const vendorPrefixes = ['-webkit-', '-moz-', '-ms-', '-o-'];
 const reFunctions = new RegExp(`^(${vendorPrefixes.join('|')})?(${cssFunctions.join('|')})`, 'i');
 const rePunctuation = new RegExp(`^(\\${Punctuation.chars.join('|\\')})`);
-const reColorFunctions = /^(hsla?|hwb|lab|lch|rgba?)$/i;
+const reColorFunctions = /^(hsla?|hwb|(ok)?lab|(ok)?lch|rgba?)$/i;
 const reVar = /^var$/i;
 const reVarPrefix = /^--[^\s]+$/;
 
diff --git a/test/fixtures/func.js b/test/fixtures/func.js
index 562b243..1a4eefe 100644
--- a/test/fixtures/func.js
+++ b/test/fixtures/func.js
@@ -26,7 +26,9 @@ module.exports = {
     'RGBA( 29, 439 , 29 )',
     'RgBa( 29, 439 , 29 )',
     'Lab( 40%  56.6   39 )',
+    'okLab( 40%  56.6   39 )',
     'lCH(40% 68.8 34.5 / 50%)',
+    'oklCH(40% 68.8 34.5 / 50%)',
     'hwb(90deg 0% 0% / 0.5)',
     'calc(-0.5 * var(foo))',
     'calc(var(--foo)*var(--bar))',