diff --git a/libosmscout-client/include/osmscoutclient/DBInstance.h b/libosmscout-client/include/osmscoutclient/DBInstance.h
index 9a78c9c1b..f0c2af86d 100644
--- a/libosmscout-client/include/osmscoutclient/DBInstance.h
+++ b/libosmscout-client/include/osmscoutclient/DBInstance.h
@@ -89,6 +89,12 @@ class OSMSCOUT_CLIENT_API DBInstance
     lastUsage=std::chrono::steady_clock::now();
   };
 
+  DBInstance(const DBInstance&) = delete;
+  DBInstance(DBInstance&&) = delete;
+
+  DBInstance& operator=(const DBInstance&) = delete;
+  DBInstance& operator=(DBInstance&&) = delete;
+
   virtual ~DBInstance()
   {
     Close();