diff --git a/src/service/rooms/timeline/append.rs b/src/service/rooms/timeline/append.rs
index 35b3771d1..5bc7d8f87 100644
--- a/src/service/rooms/timeline/append.rs
+++ b/src/service/rooms/timeline/append.rs
@@ -5,7 +5,7 @@
 	sync::Arc,
 	time::Instant,
 };
-
+use std::ops::Not;
 use conduwuit::{
 	Err, Result, debug, debug_warn,
 	matrix::{Event, PduEvent},
@@ -190,6 +190,7 @@ async fn progress_state_and_extremities(
 					.pdu_metadata
 					.is_event_referenced(&incoming_pdu.room_id_or_hash(), &extremity)
 					.await
+					.not()
 					.then_some(extremity)
 			})
 			.collect()