diff --git a/libuavcan/include/uavcan/node/service_client.hpp b/libuavcan/include/uavcan/node/service_client.hpp
index ab09addd5e..419459e6ac 100644
--- a/libuavcan/include/uavcan/node/service_client.hpp
+++ b/libuavcan/include/uavcan/node/service_client.hpp
@@ -71,9 +71,9 @@ static Stream& operator<<(Stream& s, const ServiceCallResult<DataType>& scr)
 
 template <typename DataType_,
 #if UAVCAN_CPP_VERSION >= UAVCAN_CPP11
-          typename Callback = std::function<void (const ServiceCallResult<DataType_>&)>
+          typename Callback_ = std::function<void (const ServiceCallResult<DataType_>&)>
 #else
-          typename Callback = void (*)(const ServiceCallResult<DataType_>&)
+          typename Callback_ = void (*)(const ServiceCallResult<DataType_>&)
 #endif
           >
 class ServiceClient
@@ -86,6 +86,7 @@ public:
     typedef typename DataType::Request RequestType;
     typedef typename DataType::Response ResponseType;
     typedef ServiceCallResult<DataType> ServiceCallResultType;
+    typedef Callback_ Callback;
 
 private:
     typedef ServiceClient<DataType, Callback> SelfType;
diff --git a/libuavcan/include/uavcan/node/service_server.hpp b/libuavcan/include/uavcan/node/service_server.hpp
index 05146550c3..345c13dc1b 100644
--- a/libuavcan/include/uavcan/node/service_server.hpp
+++ b/libuavcan/include/uavcan/node/service_server.hpp
@@ -21,11 +21,11 @@ namespace uavcan
 
 template <typename DataType_,
 #if UAVCAN_CPP_VERSION >= UAVCAN_CPP11
-          typename Callback = std::function<void (const ReceivedDataStructure<typename DataType_::Request>&,
-                                                  typename DataType_::Response&)>,
+          typename Callback_ = std::function<void (const ReceivedDataStructure<typename DataType_::Request>&,
+                                                   typename DataType_::Response&)>,
 #else
-          typename Callback = void (*)(const ReceivedDataStructure<typename DataType_::Request>&,
-                                       typename DataType_::Response&),
+          typename Callback_ = void (*)(const ReceivedDataStructure<typename DataType_::Request>&,
+                                        typename DataType_::Response&),
 #endif
           unsigned NumStaticReceivers = 2,
           unsigned NumStaticBufs = 1>
@@ -38,6 +38,7 @@ public:
     typedef DataType_ DataType;
     typedef typename DataType::Request RequestType;
     typedef typename DataType::Response ResponseType;
+    typedef Callback_ Callback;
 
 private:
     typedef typename TransferListenerInstantiationHelper<RequestType, NumStaticReceivers, NumStaticBufs>::Type
diff --git a/libuavcan/include/uavcan/node/subscriber.hpp b/libuavcan/include/uavcan/node/subscriber.hpp
index 27a5d46318..d374ebb9b7 100644
--- a/libuavcan/include/uavcan/node/subscriber.hpp
+++ b/libuavcan/include/uavcan/node/subscriber.hpp
@@ -21,9 +21,9 @@ namespace uavcan
 
 template <typename DataType_,
 #if UAVCAN_CPP_VERSION >= UAVCAN_CPP11
-          typename Callback = std::function<void (const ReceivedDataStructure<DataType_>&)>,
+          typename Callback_ = std::function<void (const ReceivedDataStructure<DataType_>&)>,
 #else
-          typename Callback = void (*)(const ReceivedDataStructure<DataType_>&),
+          typename Callback_ = void (*)(const ReceivedDataStructure<DataType_>&),
 #endif
           unsigned NumStaticReceivers = 2,
           unsigned NumStaticBufs = 1>
@@ -32,6 +32,10 @@ class Subscriber : public GenericSubscriber<DataType_, DataType_,
                                                                                          NumStaticReceivers,
                                                                                          NumStaticBufs>::Type>
 {
+public:
+    typedef Callback_ Callback;
+
+private:
     typedef typename TransferListenerInstantiationHelper<DataType_, NumStaticReceivers, NumStaticBufs>::Type
         TransferListenerType;
     typedef GenericSubscriber<DataType_, DataType_, TransferListenerType> BaseType;
diff --git a/libuavcan/include/uavcan/node/timer.hpp b/libuavcan/include/uavcan/node/timer.hpp
index 3f291677b3..4020f65933 100644
--- a/libuavcan/include/uavcan/node/timer.hpp
+++ b/libuavcan/include/uavcan/node/timer.hpp
@@ -64,9 +64,13 @@ public:
 };
 
 
-template <typename Callback>
+template <typename Callback_>
 class TimerEventForwarder : public TimerBase
 {
+public:
+    typedef Callback_ Callback;
+
+private:
     Callback callback_;
 
     void handleTimerEvent(const TimerEvent& event)