diff --git a/.gitignore b/.gitignore
index 58cad32..0a43809 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,4 +12,4 @@ sapper
 runtime.js
 dist
 !rollup.config.js
-templates/*.js
\ No newline at end of file
+templates/*.mjs
\ No newline at end of file
diff --git a/rollup.config.js b/rollup.config.js
index b8c76fe..27a4cf2 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -16,7 +16,7 @@ function template(kind, external, target) {
 	return {
 		input: `templates/src/${kind}/index.ts`,
 		output: {
-			file: `templates/${kind}.js`,
+			file: `templates/${kind}.mjs`,
 			format: 'es'
 		},
 		external,