diff --git a/graphics/opengl/src/main/java/de/staropensource/sosengine/graphics/opengl/classes/Window.java b/graphics/opengl/src/main/java/de/staropensource/sosengine/graphics/opengl/classes/Window.java
index 0d39d52..fbe8f39 100644
--- a/graphics/opengl/src/main/java/de/staropensource/sosengine/graphics/opengl/classes/Window.java
+++ b/graphics/opengl/src/main/java/de/staropensource/sosengine/graphics/opengl/classes/Window.java
@@ -131,7 +131,7 @@ public class Window extends de.staropensource.sosengine.graphics.classes.Window
      * @since v1-alpha2
      */
     public long getIdentifierAsLong() {
-        return Long.getLong(getIdentifier());
+        return Long.parseLong(getIdentifier());
     }
 
     /**