diff --git a/src/login/logind-button.c b/src/login/logind-button.c
index 0defa6b..9944eb2 100644
--- a/src/login/logind-button.c
+++ b/src/login/logind-button.c
@@ -341,6 +341,7 @@ int button_open(Button *b) {
 
         (void) button_set_mask(b);
 
+        b->io_event_source = sd_event_source_unref(b->io_event_source);
         r = sd_event_add_io(b->manager->event, &b->io_event_source, b->fd, EPOLLIN, button_dispatch, b);
         if (r < 0) {
                 log_error_errno(r, "Failed to add button event: %m");