diff --git a/src/db/db/gsiDeclDbNetlistCompare.cc b/src/db/db/gsiDeclDbNetlistCompare.cc
index 63ee7405b..d9dd10c2c 100644
--- a/src/db/db/gsiDeclDbNetlistCompare.cc
+++ b/src/db/db/gsiDeclDbNetlistCompare.cc
@@ -308,10 +308,19 @@ public:
   gsi::Callback cb_pin_mismatch;
   gsi::Callback cb_match_subcircuits;
   gsi::Callback cb_subcircuit_mismatch;
+
+private:
+  GenericNetlistCompareLogger (const GenericNetlistCompareLogger &d);
+  GenericNetlistCompareLogger &operator= (const GenericNetlistCompareLogger &d);
 };
 
 }
 
+namespace tl
+{
+  template<> struct type_traits<GenericNetlistCompareLogger> : public tl::type_traits<db::NetlistCompareLogger> { };
+}
+
 namespace gsi
 {