diff --git a/scripts/postcss/tests/css-compile-variables.test.js b/scripts/postcss/tests/css-compile-variables.test.js
index e20e195f..e40751db 100644
--- a/scripts/postcss/tests/css-compile-variables.test.js
+++ b/scripts/postcss/tests/css-compile-variables.test.js
@@ -108,7 +108,7 @@ module.exports.tests = function tests() {
                 --my-alias--darker-20: ${transformedColor2.hex()};
             }
             `;
-            await run( inputCSS, outputCSS, { }, assert);
+            await run( inputCSS, outputCSS, {derive}, assert);
         },
 
         "compiledVariables map is populated": async (assert) => {
@@ -150,7 +150,7 @@ module.exports.tests = function tests() {
                 --foo-color--darker-5: ${transformedColorDarker.hex()};
             }
             `;
-            await run( inputCSS, outputCSS, {}, assert);
+            await run( inputCSS, outputCSS, {derive}, assert);
         }
     };
 };