diff -r c78400096127 -r 788e083db48b src/ai/api/ai_abstractlist.hpp
--- a/src/ai/api/ai_abstractlist.hpp	Thu Jul 19 16:17:10 2007 +0000
+++ b/src/ai/api/ai_abstractlist.hpp	Thu Jul 19 17:13:38 2007 +0000
@@ -223,7 +223,7 @@
 	/**
 	 * The definition how valuators should look.
 	 */
-	class Valuator {
+	class Valuator : public AIObject {
 		/* Make this valuator a friend of AIAbstractList, so we can access the private.
 		 *  Nobody else should ever call Valuate. */
 		friend class AIAbstractList;