diff --git a/src/mime/type.go b/src/mime/type.go
index 53bf41e2e43..64e26ffb7cc 100644
--- a/src/mime/type.go
+++ b/src/mime/type.go
@@ -62,7 +62,7 @@ var builtinTypesLower = map[string]string{
 	".htm":  "text/html; charset=utf-8",
 	".html": "text/html; charset=utf-8",
 	".jpg":  "image/jpeg",
-	".js":   "application/x-javascript",
+	".js":   "application/javascript",
 	".wasm": "application/wasm",
 	".pdf":  "application/pdf",
 	".png":  "image/png",