diff --git a/js/ui/screenshot.js b/js/ui/screenshot.js
index f0e1c4825..a314dfcea 100644
--- a/js/ui/screenshot.js
+++ b/js/ui/screenshot.js
@@ -106,7 +106,7 @@ var ScreenshotService = class {
     }
 
     ScreenshotAreaAsync(params, invocation) {
-        let [x, y, width, height, flash, filename, callback] = params;
+        let [x, y, width, height, flash, filename] = params;
         [x, y, width, height] = this._scaleArea(x, y, width, height);
         if (!this._checkArea(x, y, width, height)) {
             invocation.return_error_literal(Gio.IOErrorEnum,