diff --git a/src/obj.h b/src/obj.h
index 071a6361..944a67da 100644
--- a/src/obj.h
+++ b/src/obj.h
@@ -56,6 +56,7 @@ struct Slice {
         if(stop < 0) stop += len;
         if(start < 0) start = 0;
         if(stop > len) stop = len;
+        if(stop < start) stop = start;
     }
 };