diff --git a/modules/ripple_app/basics/ripple_RPCServerHandler.h b/modules/ripple_app/basics/ripple_RPCServerHandler.h
index 537ff265e4..2f0f543888 100644
--- a/modules/ripple_app/basics/ripple_RPCServerHandler.h
+++ b/modules/ripple_app/basics/ripple_RPCServerHandler.h
@@ -7,6 +7,8 @@
 #ifndef RIPPLE_RPCSERVERHANDLER_H_INCLUDED
 #define RIPPLE_RPCSERVERHANDLER_H_INCLUDED
 
+class NetworkOPs;
+
 /** Handles RPC requests.
 */
 class RPCServerHandler : public RPCServer::Handler
diff --git a/modules/ripple_app/main/ripple_Application.h b/modules/ripple_app/main/ripple_Application.h
index d705082122..458ee9ea4c 100644
--- a/modules/ripple_app/main/ripple_Application.h
+++ b/modules/ripple_app/main/ripple_Application.h
@@ -16,6 +16,7 @@ class Peers;
 class IProofOfWorkFactory;
 class UniqueNodeList;
 class IValidations;
+class Validators;
 
 class NodeStore;
 class JobQueue;