diff --git a/compiler/types.nim b/compiler/types.nim
index b163ca4e9..63a87f14e 100644
--- a/compiler/types.nim
+++ b/compiler/types.nim
@@ -756,7 +756,7 @@ type
 
   TTypeCmpFlags* = set[TTypeCmpFlag]
 
-  TSameTypeClosure = object {.pure.}
+  TSameTypeClosure = object
     cmp: TDistinctCompare
     recCheck: int
     flags: TTypeCmpFlags