diff --git a/src/lib/setupTrackingContext.js b/src/lib/setupTrackingContext.js
index 419dd8594..5bd90701d 100644
--- a/src/lib/setupTrackingContext.js
+++ b/src/lib/setupTrackingContext.js
@@ -80,7 +80,7 @@ function getTailwindConfig(configOrPath, cssThemeValues) {
 // Retrieve an existing context from cache if possible (since contexts are unique per
 // source path), or set up a new one (including setting up watchers and registering
 // plugins) then return it
-export default function setupTrackingContext(configOrPath, cssThemeValues) {
+export default function setupTrackingContext(configOrPath, cssThemeValues = {}) {
   return ({ tailwindDirectives, registerDependency }) => {
     return (root, result) => {
       let [tailwindConfig, userConfigPath, tailwindConfigHash, configDependencies] =