diff --git a/compiler/ast.nim b/compiler/ast.nim
index 9db5a4e34f..25958f580b 100644
--- a/compiler/ast.nim
+++ b/compiler/ast.nim
@@ -784,7 +784,7 @@ type
       tab*: TStrTable         # interface table for modules
     of skLet, skVar, skField, skForVar:
       guard*: PSym
-      bitsize*: BiggestInt
+      bitsize*: int
     else: nil
     magic*: TMagic
     typ*: PType