diff --git a/sicshipadaba.c b/sicshipadaba.c
index a656d20c..fa88f53f 100644
--- a/sicshipadaba.c
+++ b/sicshipadaba.c
@@ -1461,7 +1461,7 @@ static int MakeHdbNode(SConnection *pCon, SicsInterp *pSics, void *pData,
                 eError);
             return 0;
         } else {
-         length = atoi(argv[3]);
+         length = atoi(argv[4]);
         }
      }