diff --git a/library/Icinga/Application/Modules/Module.php b/library/Icinga/Application/Modules/Module.php
index de40266e1..b5eafbdb0 100644
--- a/library/Icinga/Application/Modules/Module.php
+++ b/library/Icinga/Application/Modules/Module.php
@@ -1242,22 +1242,6 @@ class Module
         return $this->includeScript($this->configScript);
     }
 
-    /**
-     * Register a hook
-     *
-     * @param   string  $name   Name of the hook
-     * @param   string  $class  Class of the hook w/ namespace
-     * @param   string  $key
-     *
-     * @return  $this
-     *
-     * @deprecated              Deprecated in favor of {@link provideHook()}. Will be removed in version 2.2.0
-     */
-    protected function registerHook($name, $class, $key = null)
-    {
-        return $this->provideHook($name, $class, $key);
-    }
-
     protected function slashesToNamespace($class)
     {
         $list = explode('/', $class);
@@ -1275,12 +1259,10 @@ class Module
      * @param   string  $implementation [optional] Fully qualified name of the class providing the hook implementation.
      *                                  Defaults to the module's ProvidedHook namespace plus the hook's name for the
      *                                  class name. Web 2's namespace separator is \\ (double backslash) at the moment
-     * @param   string  $key            No-op arg for compatibility reasons. This argument is deprecated and will be
-     *                                  removed in version 2.2.0
      *
      * @return  $this
      */
-    protected function provideHook($name, $implementation = null, $key = null)
+    protected function provideHook($name, $implementation = null)
     {
         if ($implementation === null) {
             $implementation = $name;