diff --git a/org/w3c/css/values/ColorMix.java b/org/w3c/css/values/ColorMix.java
index 6cf2ecde3..233c99921 100644
--- a/org/w3c/css/values/ColorMix.java
+++ b/org/w3c/css/values/ColorMix.java
@@ -119,6 +119,7 @@ public static CssValue parseColorInterpolationMethod(ApplContext ac, CssExpressi
                 return new CssValueList(values);
             } else {
                 val = exp.getValue();
+                op = exp.getOperator();
                 if (val.getType() == CssTypes.CSS_IDENT) {
                     id = val.getIdent();
                     if (getAllowedValue(id, hueInterpolationMethodModifiers) != null) {
@@ -231,7 +232,7 @@ public String toString() {
             StringBuilder sb = new StringBuilder("color-mix(");
             boolean isFirst = true;
             if (color_interpolation_method != null) {
-                sb.append(color_interpolation_method).append(", ");
+                sb.append(color_interpolation_method);
                 isFirst = false;
             }
             for (CssValue v : color_percentages) {