diff --git a/lib/CodeGen/CodeGenFunction.h b/lib/CodeGen/CodeGenFunction.h
index 43c968b..0838cf0 100644
--- a/lib/CodeGen/CodeGenFunction.h
+++ b/lib/CodeGen/CodeGenFunction.h
@@ -452,11 +452,11 @@
                                  const ThunkAdjustment &Adjustment);
 
   /// GenerateThunk - Generate a thunk for the given method
-  llvm::Constant *GenerateThunk(llvm::Function *Fn, const GlobalDecl &GD,
+  llvm::Constant *GenerateThunk(llvm::Function *Fn, GlobalDecl GD,
                                 bool Extern, 
                                 const ThunkAdjustment &ThisAdjustment);
   llvm::Constant *
-  GenerateCovariantThunk(llvm::Function *Fn, const GlobalDecl &GD, 
+  GenerateCovariantThunk(llvm::Function *Fn, GlobalDecl GD,
                          bool Extern,
                          const CovariantThunkAdjustment &Adjustment);