diff --git a/stateless/multi_keys.nim b/stateless/multi_keys.nim
index 710b510839..0ce9643762 100644
--- a/stateless/multi_keys.nim
+++ b/stateless/multi_keys.nim
@@ -32,7 +32,7 @@ type
   MultiKeysRef* = ref MultiKeys
 
   Group* = object
-    first*, last*: int16
+    first*, last*: int
 
   BranchGroup* = object
     mask*: uint