diff --git a/secure/simul_efun/simul_efun.c b/secure/simul_efun/simul_efun.c
index 56d01b4..a4b654a 100644
--- a/secure/simul_efun/simul_efun.c
+++ b/secure/simul_efun/simul_efun.c
@@ -1789,7 +1789,7 @@
   return euid; // 'sichere' euid zurueckgeben
 }
 
-nomask int set_light(int i)
+deprecated nomask int set_light(int i)
 // erhoeht das Lichtlevel eines Objekts um i
 // result: das Lichtlevel innerhalb des Objekts
 {