diff --git a/index.js b/index.js
index 9d0ccb9..8a5b46d 100644
--- a/index.js
+++ b/index.js
@@ -26,6 +26,7 @@ let webpackResolve;
 const defaultLookups = {
   '.js': jsLookup,
   '.jsx': jsLookup,
+  '.mjs': jsLookup,
   '.less': sassLookup, // Less and Sass imports are very similar
   '.sass': sassLookup,
   '.scss': sassLookup,
diff --git a/test/test.js b/test/test.js
index 6bca2b5..3e0e7eb 100644
--- a/test/test.js
+++ b/test/test.js
@@ -16,6 +16,7 @@ describe('filing-cabinet', () => {
       const expected = [
         '.js',
         '.jsx',
+        '.mjs',
         '.less',
         '.sass',
         '.scss',