diff --git a/include/ircd/ctx/future.h b/include/ircd/ctx/future.h
index ebed419a7..42ad58832 100644
--- a/include/ircd/ctx/future.h
+++ b/include/ircd/ctx/future.h
@@ -58,8 +58,6 @@ class ircd::ctx::future
 	T get();
 	operator T()                                 { return get();                                   }
 
-	void then(decltype(shared_state<T>::callback));
-
 	future();
 	future(promise<T> &promise);
 };
@@ -84,8 +82,6 @@ class ircd::ctx::future<void>
 	template<class duration> future_status wait(const duration &d) const;
 	void wait() const;
 
-	void then(decltype(shared_state<void>::callback));
-
 	future();
 	future(promise<void> &promise);
 };
@@ -140,21 +136,6 @@ ircd::ctx::future<T>::future(promise<T> &promise)
 {
 }
 
-template<class T>
-void
-ircd::ctx::future<T>::then(decltype(shared_state<T>::callback) cb)
-{
-	assert(valid());
-	st->callback = std::move(cb);
-}
-
-inline void
-ircd::ctx::future<void>::then(decltype(shared_state<void>::callback) cb)
-{
-	assert(valid());
-	st->callback = std::move(cb);
-}
-
 template<class T>
 T
 ircd::ctx::future<T>::get()
diff --git a/include/ircd/ctx/promise.h b/include/ircd/ctx/promise.h
index 74f8e5c59..c38ddb2fd 100644
--- a/include/ircd/ctx/promise.h
+++ b/include/ircd/ctx/promise.h
@@ -147,10 +147,6 @@ ircd::ctx::promise<T>::set_value(T&& val)
 	st->val = std::move(val);
 	st->finished = true;
 	st->cond.notify_all();
-	if(st->callback) ircd::post([st(st)]
-	{
-		st->callback(st->eptr, st->val);
-	});
 }
 
 inline void
@@ -160,10 +156,6 @@ ircd::ctx::promise<void>::set_value()
 	assert(!finished());
 	st->finished = true;
 	st->cond.notify_all();
-	if(st->callback) ircd::post([st(st)]
-	{
-		st->callback(st->eptr);
-	});
 }
 
 template<class T>
@@ -175,10 +167,6 @@ ircd::ctx::promise<T>::set_value(const T &val)
 	st->val = val;
 	st->finished = true;
 	st->cond.notify_all();
-	if(st->callback) ircd::post([st(st)]
-	{
-		st->callback(st->eptr, st->val);
-	});
 }
 
 inline void
@@ -189,10 +177,6 @@ ircd::ctx::promise<void>::set_exception(std::exception_ptr eptr)
 	st->eptr = std::move(eptr);
 	st->finished = true;
 	st->cond.notify_all();
-	if(st->callback) ircd::post([st(st)]
-	{
-		st->callback(st->eptr);
-	});
 }
 
 template<class T>
@@ -204,8 +188,4 @@ ircd::ctx::promise<T>::set_exception(std::exception_ptr eptr)
 	st->eptr = std::move(eptr);
 	st->finished = true;
 	st->cond.notify_all();
-	if(st->callback) ircd::post([st(st)]
-	{
-		st->callback(st->eptr, st->val);
-	});
 }
diff --git a/include/ircd/ctx/shared_state.h b/include/ircd/ctx/shared_state.h
index 58d751cf8..e9d422777 100644
--- a/include/ircd/ctx/shared_state.h
+++ b/include/ircd/ctx/shared_state.h
@@ -36,7 +36,6 @@ struct ircd::ctx::shared_state
 	using reference_type  = T &;
 
 	T val;
-	std::function<void (std::exception_ptr, T) noexcept> callback;
 
 	std::shared_ptr<const shared_state<T>> share() const;
 	std::shared_ptr<shared_state<T>> share();
@@ -49,8 +48,6 @@ struct ircd::ctx::shared_state<void>
 {
 	using value_type      = void;
 
-	std::function<void (std::exception_ptr) noexcept> callback;
-
 	std::shared_ptr<const shared_state<void>> share() const;
 	std::shared_ptr<shared_state<void>> share();
 };