diff --git a/datastore/sql.nim b/datastore/sql.nim
index 4550858..5b68b53 100644
--- a/datastore/sql.nim
+++ b/datastore/sql.nim
@@ -77,7 +77,8 @@ method queryIter*(
     for resp in qhandle.iter():
       without qres =? resp, err:
         yield QueryResponse.failure err
-      let k = qres.key.map(proc(k: KeyId): Key = Key.init($k).expect("valid key"))
+      let k = qres.key.map() do(k: KeyId) -> Key:
+        Key.init($k).expect("valid key")
       let v: seq[byte] = qres.data
       yield success (k, v)