1 files changed, 1 insertions, 1 deletions
diff --git a/gc.c b/gc.c
index 656d505424..f3a39905c0 100644
--- a/gc.c
+++ b/gc.c
@@ -348,7 +348,7 @@ rb_gc_mark_locations(start, end)
 	start = end;
 	end = tmp;
     }
-    n = end - start;
+    n = end - start + 1;
     mark_locations_array(start,n);
 }