diff --git a/src/condition_variable.hpp b/src/condition_variable.hpp
index 4e20b401..7e2ad89b 100644
--- a/src/condition_variable.hpp
+++ b/src/condition_variable.hpp
@@ -164,6 +164,12 @@ namespace zmq
 
                 timeout.tv_sec += timeout_ / 1000;
                 timeout.tv_nsec += (timeout_ % 1000) * 1000000;
+
+                if (timeout.tv_nsec > 1E9) {
+                    timeout.tv_sec++;
+                    timeout.tv_nsec -= 1E9;
+                }
+
                 rc = pthread_cond_timedwait (&cond, mutex_->get_mutex (), &timeout);
             }
             else