diff --git a/media/mediaType.go b/media/mediaType.go
index 47a74ec56..4fceac222 100644
--- a/media/mediaType.go
+++ b/media/mediaType.go
@@ -229,7 +229,7 @@ var (
 	SASSType       = newMediaType("text", "x-sass", []string{"sass"})
 	CSVType        = newMediaType("text", "csv", []string{"csv"})
 	HTMLType       = newMediaType("text", "html", []string{"html"})
-	JavascriptType = newMediaType("application", "javascript", []string{"js"})
+	JavascriptType = newMediaType("application", "javascript", []string{"js", "jsm", "mjs"})
 	TypeScriptType = newMediaType("application", "typescript", []string{"ts"})
 	TSXType        = newMediaType("text", "tsx", []string{"tsx"})
 	JSXType        = newMediaType("text", "jsx", []string{"jsx"})