diff --git a/package/src/ExpressiveCode/index.ts b/package/src/ExpressiveCode/index.ts
index c4316ef..8dc519a 100644
--- a/package/src/ExpressiveCode/index.ts
+++ b/package/src/ExpressiveCode/index.ts
@@ -27,5 +27,5 @@ if (userThemes) {
 }
 
 // Create a custom instance of ExpressiveCode
-export const engine = new ExpressiveCode({ themes })
+export const engine = new ExpressiveCode({ themes: userThemes?.length ? themes : undefined })
 
diff --git a/playground/package.json b/playground/package.json
index fbc3d29..78eda6d 100644
--- a/playground/package.json
+++ b/playground/package.json
@@ -11,8 +11,8 @@
     "astro": "astro"
   },
   "dependencies": {
-    "astro": "^4.5.9"
-    "@matthiesenxyz/astro-gists": "workspace:*",
+    "astro": "^4.5.9",
+    "@matthiesenxyz/astro-gists": "workspace:*"
   },
   "devDependencies": {
     "@astrojs/mdx": "^2.2.1",