diff --git a/Thirdparty/DBoW2/DBoW2/ScoringObject.h b/Thirdparty/DBoW2/DBoW2/ScoringObject.h
index 18c1afee..2db6b8b5 100644
--- a/Thirdparty/DBoW2/DBoW2/ScoringObject.h
+++ b/Thirdparty/DBoW2/DBoW2/ScoringObject.h
@@ -39,7 +39,8 @@ class GeneralScoring
 	static const double LOG_EPS; 
   // If you change the type of WordValue, make sure you change also the
 	// epsilon value (this is needed by the KL method)
-	
+
+  virtual ~GeneralScoring() {} //!< Required for virtual base classes	
 };
 
 /**