diff --git a/src/usermanager.c b/src/usermanager.c
index 5f0ab00..cb72871 100644
--- a/src/usermanager.c
+++ b/src/usermanager.c
@@ -19,6 +19,8 @@
 
 #include "uhub.h"
 
+#define USERMANAGER_TIMER
+
 /*
  * This callback function is used to clear user objects from the userlist.
  * Should only be used in uman_shutdown().