diff --git a/zmq.hpp b/zmq.hpp
index f98549dc..b52a1628 100644
--- a/zmq.hpp
+++ b/zmq.hpp
@@ -1223,7 +1223,7 @@ template<typename T = void> class poller_t
     }
 
     size_t wait_all(std::vector<zmq_poller_event_t> &poller_events,
-                    const std::chrono::microseconds timeout)
+                    const std::chrono::milliseconds timeout)
     {
         int rc = zmq_poller_wait_all(poller_ptr.get(), poller_events.data(),
                                      static_cast<int>(poller_events.size()),