diff --git a/hmcontrol.c b/hmcontrol.c
index 198fbc72..d2d195b6 100644
--- a/hmcontrol.c
+++ b/hmcontrol.c
@@ -310,7 +310,7 @@ int HMControlAction(SConnection *pCon, SicsInterp *pSics,
   assert(self);
   if(argc < 4)
   {
-    sprintf("ERROR: Usage %s start preset mode", argv[0]);
+    sprintf(pBueffel,"ERROR: Usage %s start preset mode", argv[0]);
     SCWrite(pCon,pBueffel,eError);
     return 0;
   }