diff --git a/libs/util/sys.c b/libs/util/sys.c
index cc0dc45ff..1955a037b 100644
--- a/libs/util/sys.c
+++ b/libs/util/sys.c
@@ -1254,8 +1254,10 @@ Sys_Shutdown (void)
 	}
 	if (sys_print_msg) {
 		dstring_delete (sys_print_msg);
+		sys_print_msg = 0;
 	}
 	if (sys_debuglog_data) {
 		dstring_delete (sys_debuglog_data);
+		sys_debuglog_data = 0;
 	}
 }