Index: src/InitTweak/InitTweak.cc
===================================================================
--- src/InitTweak/InitTweak.cc	(revision bd41764cef3326642e00d1a72b925ec627f0d2ed)
+++ src/InitTweak/InitTweak.cc	(revision ea7d2b051267e571f113e8dabae0d886eda94432)
@@ -98,4 +98,5 @@
 	class InitExpander::ExpanderImpl {
 	public:
+		virtual ~ExpanderImpl() = default;
 		virtual std::list< Expression * > next( std::list< Expression * > & indices ) = 0;
 		virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices ) = 0;