diff --git a/lib/rollup-svenchify.js b/lib/rollup-svenchify.js
index c8d6884..0b25e90 100644
--- a/lib/rollup-svenchify.js
+++ b/lib/rollup-svenchify.js
@@ -75,10 +75,12 @@ export default SvenchPlugin => {
         return {
           ...config,
           ...svelte,
-          extensions: mergeExtensions(
-            config.extensions || defaultSvelteExtensions,
-            svelte.extensions || extensions
-          ),
+          extensions:
+            svelte.extensions ||
+            mergeExtensions(
+              config.extensions || defaultSvelteExtensions,
+              extensions
+            ),
           preprocess: preprocessor,
         }
       }