diff --git a/inc/id_button.hpp b/inc/id_button.hpp
index af100ef..8116185 100644
--- a/inc/id_button.hpp
+++ b/inc/id_button.hpp
@@ -51,6 +51,9 @@
                 IOError();
         }
 
+        char buf;
+        ::read(fd, &buf, sizeof(buf));
+
         ret = sd_event_add_io(event.get(), nullptr, fd, EPOLLPRI,
                               callbackHandler, this);
         if (ret < 0)