diff --git a/python/pyphantomjs/bootstrap.js b/python/pyphantomjs/bootstrap.js
index d897524fc0..25697b00d8 100644
--- a/python/pyphantomjs/bootstrap.js
+++ b/python/pyphantomjs/bootstrap.js
@@ -63,7 +63,7 @@ window.WebPage = function() {
                 onScriptLoaded(scriptUrl);
                 // And disconnect the signal handler
                 try {
-                    this.javaScriptAlertSent.disconnect(this);
+                    this.javaScriptAlertSent.disconnect(arguments.callee);
                 } catch (e) {}
             }
         });
diff --git a/src/bootstrap.js b/src/bootstrap.js
index d897524fc0..25697b00d8 100644
--- a/src/bootstrap.js
+++ b/src/bootstrap.js
@@ -63,7 +63,7 @@ window.WebPage = function() {
                 onScriptLoaded(scriptUrl);
                 // And disconnect the signal handler
                 try {
-                    this.javaScriptAlertSent.disconnect(this);
+                    this.javaScriptAlertSent.disconnect(arguments.callee);
                 } catch (e) {}
             }
         });