diff --git a/runtime/syntax/javascript.yaml b/runtime/syntax/javascript.yaml
index 84f9d275..0b98f855 100644
--- a/runtime/syntax/javascript.yaml
+++ b/runtime/syntax/javascript.yaml
@@ -1,7 +1,7 @@
 filetype: javascript
 
 detect:
-    filename: "(\\.js$|\\.es[5678]?$)"
+    filename: "(\\.js$|\\.es[5678]?$|\\.mjs$)"
     header: "^#!.*/(env +)?node( |$)"
 
 rules: