diff --git a/atom/renderer/lib/init.coffee b/atom/renderer/lib/init.coffee
index 3fb4ceaabf..a6f571b213 100644
--- a/atom/renderer/lib/init.coffee
+++ b/atom/renderer/lib/init.coffee
@@ -31,7 +31,7 @@ window.addEventListener 'unload', ->
 # Set the __filename to the path of html file if it's file: or asar: protocol.
 if window.location.protocol in ['file:', 'asar:']
   pathname =
-    if process.platform is 'win32'
+    if process.platform is 'win32' and window.location.pathname[0] is '/'
       window.location.pathname.substr 1
     else
       window.location.pathname