diff --git a/src/lib/subs/maps.c b/src/lib/subs/maps.c
index 6d5957e7..5e2a6a47 100644
--- a/src/lib/subs/maps.c
+++ b/src/lib/subs/maps.c
@@ -319,7 +319,7 @@ bmnxtsct(struct nstr_sect *np)
 	    if (np->curdist > np->dist)
 		continue;
 	}
-	np->id = sctoff(np->x, np->y);
+	np->id = XYOFFSET(np->x, np->y);
 	return 1;
     }
     /*NOTREACHED*/
diff --git a/src/lib/subs/nxtsct.c b/src/lib/subs/nxtsct.c
index 6ad13e6c..bbce1627 100644
--- a/src/lib/subs/nxtsct.c
+++ b/src/lib/subs/nxtsct.c
@@ -67,7 +67,7 @@ nxtsct(struct nstr_sect *np, struct sctstr *sp)
 	    if (np->curdist > np->dist)
 		continue;
 	}
-	np->id = sctoff(np->x, np->y);
+	np->id = XYOFFSET(np->x, np->y);
 	if (!np->read(EF_SECTOR, np->id, sp))
 	    continue;
 	if (np->ncond == 0)