diff --git a/fullcalendar/fullcalendar.module b/fullcalendar/fullcalendar.module
index 412a255..481ef6e 100755
--- a/fullcalendar/fullcalendar.module
+++ b/fullcalendar/fullcalendar.module
@@ -383,7 +383,7 @@
     }

     // Return the version of FullCalendar plugin.
-    $fullcalendar_plugin = file_get_contents($fullcalendar_path, NULL, NULL, 0, 40);
+    $fullcalendar_plugin = file_get_contents($fullcalendar_path, FALSE, NULL, 0, 40);
     if (preg_match($pattern, $fullcalendar_plugin, $matches)) {
       $version = $matches[1];
     }