diff --git a/include/ircd/ios.h b/include/ircd/ios.h
index de6842af8..acd15374b 100644
--- a/include/ircd/ios.h
+++ b/include/ircd/ios.h
@@ -148,6 +148,7 @@ struct ircd::ios::descriptor::stats
 struct ircd::ios::handler
 {
 	static thread_local handler *current;
+	static thread_local uint64_t epoch;
 
 	static void *allocate(handler *const &, const size_t &);
 	static void deallocate(handler *const &, void *const &, const size_t &) noexcept;
diff --git a/ircd/ios.cc b/ircd/ios.cc
index 93882f36d..eeefb7c0d 100644
--- a/ircd/ios.cc
+++ b/ircd/ios.cc
@@ -153,9 +153,14 @@ ircd::ios::descriptor::stats::operator+=(const stats &o)
 // handler
 //
 
-decltype(ircd::ios::handler::current) thread_local
+decltype(ircd::ios::handler::current)
+thread_local
 ircd::ios::handler::current;
 
+decltype(ircd::ios::handler::epoch)
+thread_local
+ircd::ios::handler::epoch;
+
 bool
 ircd::ios::handler::fault(handler *const &handler)
 noexcept
@@ -208,7 +213,7 @@ noexcept
 	assert(descriptor.stats);
 	auto &stats(*descriptor.stats);
 	++stats.calls;
-
+	++handler::epoch;
 	assert(!handler::current);
 	handler::current = handler;
 	handler->slice_start = cycles();