diff --git a/include/llvm/Transforms/Utils/Cloning.h b/include/llvm/Transforms/Utils/Cloning.h
index a6cefc55898..e32b106f1f6 100644
--- a/include/llvm/Transforms/Utils/Cloning.h
+++ b/include/llvm/Transforms/Utils/Cloning.h
@@ -22,7 +22,7 @@ class ReturnInst;
 
 /// CloneModule - Return an exact copy of the specified module
 ///
-Module *CloneModule(Module *M);
+Module *CloneModule(const Module *M);
 
 /// CloneFunction - Return a copy of the specified function, but without
 /// embedding the function into another module.  Also, any references specified