3 files changed, 3 insertions, 0 deletions
diff --git a/server/src/queryhandler.h b/server/src/queryhandler.h
index 2b67c24..4aff292 100644
--- a/server/src/queryhandler.h
+++ b/server/src/queryhandler.h
@@ -39,6 +39,7 @@
 class QueryHandler {
 public:
   QueryHandler() {}
+  virtual ~QueryHandler() {}
 
   // Execute all queries.
   virtual QueryResult exec(Query &query) = 0;
diff --git a/server/src/queryhandlerpentominos.h b/server/src/queryhandlerpentominos.h
index 3d98b25..9cc2cbf 100644
--- a/server/src/queryhandlerpentominos.h
+++ b/server/src/queryhandlerpentominos.h
@@ -42,6 +42,7 @@
 class QueryHandlerPentominos : public QueryHandler {
 public:
   QueryHandlerPentominos(TCPSocket *socket, std::string cpr);
+  ~QueryHandlerPentominos() {}
 
   // Execute all queries.
   QueryResult exec(Query &query);
diff --git a/server/src/queryhandlerpracro.h b/server/src/queryhandlerpracro.h
index 8852868..73802f0 100644
--- a/server/src/queryhandlerpracro.h
+++ b/server/src/queryhandlerpracro.h
@@ -42,6 +42,7 @@
 class QueryHandlerPracro : public QueryHandler {
 public:
   QueryHandlerPracro(Database *db, std::string cpr);
+  ~QueryHandlerPracro() {}
 
   // Execute all queries.
   QueryResult exec(Query &query);