diff --git a/include/llvm/Constant.h b/include/llvm/Constant.h
index f9d8441a675..e2b77a7e21a 100644
--- a/include/llvm/Constant.h
+++ b/include/llvm/Constant.h
@@ -19,6 +19,8 @@
 namespace llvm {
 
 class Constant : public User {
+  void operator=(const Constant &);     // Do not implement
+  Constant(const Constant &);           // Do not implement
 protected:
   Constant(const Type *Ty, ValueTy vty, Use *Ops, unsigned NumOps,
            const std::string& Name = "")
diff --git a/include/llvm/GlobalVariable.h b/include/llvm/GlobalVariable.h
index 7c6aee37f37..87df5d514fd 100644
--- a/include/llvm/GlobalVariable.h
+++ b/include/llvm/GlobalVariable.h
@@ -34,6 +34,9 @@ template<typename ValueSubClass, typename ItemParentClass, typename SymTabClass,
 class GlobalVariable : public GlobalValue {
   friend class SymbolTableListTraits<GlobalVariable, Module, Module,
                                      ilist_traits<GlobalVariable> >;
+  void operator=(const GlobalVariable &);     // Do not implement
+  GlobalVariable(const GlobalVariable &);     // Do not implement
+
   void setParent(Module *parent);
 
   GlobalVariable *Prev, *Next;
diff --git a/include/llvm/Instruction.h b/include/llvm/Instruction.h
index d9cb5859211..2b025dd8753 100644
--- a/include/llvm/Instruction.h
+++ b/include/llvm/Instruction.h
@@ -27,6 +27,9 @@ template<typename ValueSubClass, typename ItemParentClass, typename SymTabClass,
          typename SubClass> class SymbolTableListTraits;
 
 class Instruction : public User {
+  void operator=(const Instruction &);     // Do not implement
+  Instruction(const Instruction &);        // Do not implement
+
   BasicBlock *Parent;
   Instruction *Prev, *Next; // Next and Prev links for our intrusive linked list