Index: src/InitTweak/InitTweak.cc
===================================================================
--- src/InitTweak/InitTweak.cc	(revision bd41764cef3326642e00d1a72b925ec627f0d2ed)
+++ src/InitTweak/InitTweak.cc	(revision 5f91d650a7d6b8ba36b9d0b5337f23986ecdff46)
@@ -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;