diff --git a/hoot-core/src/main/cpp/hoot/core/schema/ExactTagDifferencer.h b/hoot-core/src/main/cpp/hoot/core/schema/ExactTagDifferencer.h
index 15cb5ee..1515795 100644
--- a/hoot-core/src/main/cpp/hoot/core/schema/ExactTagDifferencer.h
+++ b/hoot-core/src/main/cpp/hoot/core/schema/ExactTagDifferencer.h
@@ -22,7 +22,7 @@
* This will properly maintain the copyright information. DigitalGlobe
* copyrights will be updated automatically.
*
- * @copyright Copyright (C) 2015, 2017, 2018, 2019 DigitalGlobe (http://www.digitalglobe.com/)
+ * @copyright Copyright (C) 2015, 2017, 2018, 2019, 2020 DigitalGlobe (http://www.digitalglobe.com/)
*/
#ifndef EXACTTAGDIFFERENCER_H
#define EXACTTAGDIFFERENCER_H
@@ -42,6 +42,9 @@ public:
static std::string className() { return "hoot::ExactTagDifferencer"; }
+ ExactTagDifferencer() = default;
+ virtual ~ExactTagDifferencer() = default;
+
virtual double diff(const ConstOsmMapPtr& map, const ConstElementPtr& e1,
const ConstElementPtr& e2) const override;
};