diff --git a/index.js b/index.js
index 1406981..7f90895 100644
--- a/index.js
+++ b/index.js
@@ -5,5 +5,5 @@ require("./TransportHTTP.js");   // Can access via window.DwebTransports._transp
 require("./TransportIPFS.js");
 require("./TransportYJS.js");
 require("./TransportWEBTORRENT.js");
-window.DwebTransports = DwebTransports;
+if (typeof window !== "undefined") { window.DwebTransports = DwebTransports; }
 exports = module.exports = DwebTransports;