diff --git a/include/llvm/DerivedTypes.h b/include/llvm/DerivedTypes.h
index 7575a4d0734..8720ca6815b 100644
--- a/include/llvm/DerivedTypes.h
+++ b/include/llvm/DerivedTypes.h
@@ -22,6 +22,7 @@
 
 namespace llvm {
 
+class Value;
 template<class ValType, class TypeClass> class TypeMap;
 class FunctionValType;
 class ArrayValType;