diff --git a/www/plugins.FileOpener2.js b/www/plugins.FileOpener2.js
index e6f0e6c..725a4ad 100644
--- a/www/plugins.FileOpener2.js
+++ b/www/plugins.FileOpener2.js
@@ -43,8 +43,8 @@ FileOpener2.prototype.uninstall = function (packageId, callbackContext) {
     exec(callbackContext.success || null, callbackContext.error || null, 'FileOpener2', 'uninstall', [packageId]);
 };
 
-FileOpener2.prototype.appIsInstalled = function (packageId, options) {
-    options = options || {};
+FileOpener2.prototype.appIsInstalled = function (packageId, callbackContext) {
+    callbackContext = callbackContext || {};
     exec(options.success || null, options.error || null, 'FileOpener2', 'appIsInstalled', [packageId]);
 };