diff --git a/src/runtime/motion/index.js b/src/runtime/motion/index.js
index ea6c646dd9..10f52502d3 100644
--- a/src/runtime/motion/index.js
+++ b/src/runtime/motion/index.js
@@ -1,2 +1,2 @@
-export * from './spring';
-export * from './tweened';
+export * from './spring.js';
+export * from './tweened.js';