diff --git a/lib/pure/collections/sequtils.nim b/lib/pure/collections/sequtils.nim
index 3dba087aa8..299349a05a 100644
--- a/lib/pure/collections/sequtils.nim
+++ b/lib/pure/collections/sequtils.nim
@@ -1092,7 +1092,7 @@ template mapIt*(s: typed, op: untyped): untyped =
 
   type OutType = typeof((
     block:
-      var it{.inject.}: typeof(items(s), typeOfIter);
+      var it{.inject, used.}: typeof(items(s), typeOfIter);
       op), typeOfProc)
   when OutType is not (proc):
     # Here, we avoid to create closures in loops.