diff --git a/lib/browser/desktop-capturer.js b/lib/browser/desktop-capturer.js
index 5e8ad3e7328c..21993a9fd71d 100644
--- a/lib/browser/desktop-capturer.js
+++ b/lib/browser/desktop-capturer.js
@@ -45,7 +45,7 @@ desktopCapturer.emit = function (event, name, sources) {
       results.push({
         id: source.id,
         name: source.name,
-        thumbnail: source.thumbnail.toDataUrl()
+        thumbnail: source.thumbnail.toDataURL()
       })
     }
     return results