diff --git a/src/database/rooms/edus.rs b/src/database/rooms/edus.rs
index 9e43fe1..c48f4c2 100644
--- a/src/database/rooms/edus.rs
+++ b/src/database/rooms/edus.rs
@@ -382,7 +382,7 @@ impl RoomEdus {
                         .ok()?,
                 ))
             })
-            .take_while(|(_, timestamp)| current_timestamp - timestamp > 5 * 60_000)
+            .take_while(|(_, timestamp)| current_timestamp.saturating_sub(*timestamp) > 5 * 60_000)
         // 5 Minutes
         {
             // Send new presence events to set the user offline