diff --git a/src/leveled_penciller.erl b/src/leveled_penciller.erl
index ccddbe5..4bbf6ad 100644
--- a/src/leveled_penciller.erl
+++ b/src/leveled_penciller.erl
@@ -407,7 +407,10 @@ handle_call({fetch_keys, StartKey, EndKey, AccFun, InitAcc, MaxKeys},
             List ->
                 List
         end,
-    leveled_log:log_randomtimer("P0037", [length(L0AsList)], SW, 0.01),
+    leveled_log:log_randomtimer("P0037",
+                                [State#state.levelzero_size],
+                                SW,
+                                0.01),
     SetupFoldFun =
         fun(Level, Acc) ->
             Pointers = leveled_pmanifest:range_lookup(State#state.manifest,