diff --git a/src/modules/cfgutils/cfgutils.c b/src/modules/cfgutils/cfgutils.c
index ca7bf77ae38..d028a30918d 100644
--- a/src/modules/cfgutils/cfgutils.c
+++ b/src/modules/cfgutils/cfgutils.c
@@ -134,9 +134,9 @@ static cmd_export_t cmds[]={
 		ANY_ROUTE},
 	{"rand_event",      (cmd_function)rand_event, 0, 0, 0,
 		ANY_ROUTE},
-	{"sleep",  (cmd_function)m_sleep,  1, fixup_igp_null, 0,
+	{"sleep",  (cmd_function)m_sleep,  1, fixup_igp_null, fixup_free_igp_null,
 		ANY_ROUTE},
-	{"usleep", (cmd_function)m_usleep, 1, fixup_igp_null, 0,
+	{"usleep", (cmd_function)m_usleep, 1, fixup_igp_null, fixup_free_igp_null,
 		ANY_ROUTE},
 	{"abort",      (cmd_function)dbg_abort,        0, 0, 0,
 		ANY_ROUTE},