diff --git a/public/icvar.h b/public/icvar.h
index 2682c5a6..24b5c809 100644
--- a/public/icvar.h
+++ b/public/icvar.h
@@ -156,6 +156,7 @@ protected:
 	class ICVarIteratorInternal
 	{
 	public:
+		virtual ~ICVarIteratorInternal() {}
 		virtual void		SetFirst( void ) = 0;
 		virtual void		Next( void ) = 0;
 		virtual	bool		IsValid( void ) = 0;