diff --git a/core/modules/filters/colour-ops.js b/core/modules/filters/colour-ops.js
index 3ce9d1dca..1044f92a7 100644
--- a/core/modules/filters/colour-ops.js
+++ b/core/modules/filters/colour-ops.js
@@ -14,14 +14,23 @@ Filter operators for colour operations
 
 var Color = require("$:/core/modules/utils/dom/color.js").Color;
 
-exports["colour-lighten"] = makeColourOperator(function (c, operator, operands) {
+exports["colour-lighten"] = makeColourOperator(function (c, operator, options) {
 	return c.lighten($tw.utils.parseNumber(operator.operand));
 });
 
-exports["colour-darken"] = makeColourOperator(function (c, operator, operands) {
+exports["colour-darken"] = makeColourOperator(function (c, operator, options) {
 	return c.darken($tw.utils.parseNumber(operator.operand));
 });
 
+exports["colour-oklch"] = makeColourOperator(function (c, operator, options) {
+	var prop = ((operator.suffixes || [])[0] || ["l"])[0];
+console.log("Prop",prop,$tw.utils.parseNumber(operator.operand))
+	if(["l","c","h"].indexOf(prop) !== -1) {
+		c.oklch[prop] = $tw.utils.parseNumber(operator.operand);
+	}
+	return c;
+});
+
 function makeColourOperator(fn) {
 	return function (source, operator, options) {
 		var results = [];
diff --git a/editions/test/tiddlers/tests/data/operators/colour/ColourOklchL.tid b/editions/test/tiddlers/tests/data/operators/colour/ColourOklchL.tid
new file mode 100644
index 000000000..22d6767f8
--- /dev/null
+++ b/editions/test/tiddlers/tests/data/operators/colour/ColourOklchL.tid
@@ -0,0 +1,18 @@
+title: Operators/Colour/ColourOklchL
+description: Oklch colour function
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Output
+
+\parsermode inline
+\import [subfilter{$:/core/config/GlobalImportFilter}]
+<$text text={{{ [subfilter{Filter}] }}}/>
++
+title: Filter
+
+=[function[colour],[primary]colour-oklch[0.5]] =[function[colour],[primary]colour-oklch:l[0.5]] +[join[,]]
++
+title: ExpectedResult
+
+#3d5bb8,#3d5bb8
\ No newline at end of file