diff --git a/simgear/hla/HLAInteractionClass.hxx b/simgear/hla/HLAInteractionClass.hxx
index c45c22d7..021dff7e 100644
--- a/simgear/hla/HLAInteractionClass.hxx
+++ b/simgear/hla/HLAInteractionClass.hxx
@@ -25,6 +25,10 @@ class RTIInteractionClass;
 class HLAInteractionClass : public SGWeakReferenced {
 public:
     virtual ~HLAInteractionClass() {}
+
+private:
+    HLAInteractionClass(const HLAInteractionClass&);
+    HLAInteractionClass& operator=(const HLAInteractionClass&);
 };
 
 } // namespace simgear
diff --git a/simgear/hla/HLAObjectClass.hxx b/simgear/hla/HLAObjectClass.hxx
index b0db5ad1..3c5ace5f 100644
--- a/simgear/hla/HLAObjectClass.hxx
+++ b/simgear/hla/HLAObjectClass.hxx
@@ -95,6 +95,9 @@ protected:
     virtual HLAObjectInstance* createObjectInstance(RTIObjectInstance* rtiObjectInstance);
 
 private:
+    HLAObjectClass(const HLAObjectClass&);
+    HLAObjectClass& operator=(const HLAObjectClass&);
+
     // The internal entry points from the RTILObjectClass callback functions
     void discoverInstance(RTIObjectInstance* objectInstance, const RTIData& tag);
     void removeInstance(HLAObjectInstance& objectInstance, const RTIData& tag);