diff --git a/data/plugins/language_js.lua b/data/plugins/language_js.lua
index 40aba817..b811b026 100644
--- a/data/plugins/language_js.lua
+++ b/data/plugins/language_js.lua
@@ -3,7 +3,7 @@ local syntax = require "core.syntax"
 
 syntax.add {
   name = "JavaScript",
-  files = { "%.js$", "%.json$", "%.cson$" },
+  files = { "%.js$", "%.json$", "%.cson$", "%.mjs$", "%.cjs$" },
   comment = "//",
   block_comment = { "/*", "*/" },
   patterns = {