diff --git a/libs/gw2_analytics/src/gw2_analytics/ei_compare.py b/libs/gw2_analytics/src/gw2_analytics/ei_compare.py
index 6b1f064d..d5da4f6d 100644
--- a/libs/gw2_analytics/src/gw2_analytics/ei_compare.py
+++ b/libs/gw2_analytics/src/gw2_analytics/ei_compare.py
@@ -1072,7 +1072,7 @@ def in_slice(event: Event, _lo: int = slice_lo, _hi: int = slice_hi) -> bool:
             # exactly the absence window to every one of them -- the
             # signature was several buffs on one actor all overcounting by
             # the identical amount.
-            for alias_id in player_agent_ids(agent):
+            for alias_id in player_agent_ids(agent, slice_lo, slice_hi):
                 alias_uptime = tracker.compute_player_uptimes(
                     alias_id,
                     duration_ms,