diff --git a/src/main/java/de/tudbut/security/PermissionManager.java b/src/main/java/de/tudbut/security/PermissionManager.java
index f058604..5d4748e 100644
--- a/src/main/java/de/tudbut/security/PermissionManager.java
+++ b/src/main/java/de/tudbut/security/PermissionManager.java
@@ -45,7 +45,7 @@ public interface PermissionManager extends Cloneable {
             return clazz.getName();
         try {
             // Reset the name field so that it must be cached again
-            Field nameField = clazz.getClass().getDeclaredField("name");
+            Field nameField = Class.class.getDeclaredField("name");
             ReflectUtil.forceAccessible(nameField);
             nameField.set(clazz, null);
             // name is clean, getName can now be used.
@@ -59,7 +59,7 @@ public interface PermissionManager extends Cloneable {
                 cache[idx] = false;
             try {
                 // Unable to reset the name field, invoking the native that gets the name directly
-                Method initClassName = clazz.getClass().getDeclaredMethod("initClassName");
+                Method initClassName = Class.class.getDeclaredMethod("initClassName");
                 ReflectUtil.forceAccessible(initClassName);
                 return (String) initClassName.invoke(clazz);
             }