diff --git a/lib/CodeGen/CodeGenModule.h b/lib/CodeGen/CodeGenModule.h
index 3f1aeb8..913e4bc 100644
--- a/lib/CodeGen/CodeGenModule.h
+++ b/lib/CodeGen/CodeGenModule.h
@@ -62,6 +62,9 @@
 /// CodeGenModule - This class organizes the cross-function state that is used
 /// while generating LLVM code.
 class CodeGenModule {
+  CodeGenModule(const CodeGenModule&);  // DO NOT IMPLEMENT
+  void operator=(const CodeGenModule&); // DO NOT IMPLEMENT
+
   typedef std::vector< std::pair<llvm::Constant*, int> > CtorList;
 
   ASTContext &Context;