diff --git a/zone/task_client_state.cpp b/zone/task_client_state.cpp
index 232bd5fa8..66c4ea91c 100644
--- a/zone/task_client_state.cpp
+++ b/zone/task_client_state.cpp
@@ -419,7 +419,7 @@ void ClientTaskState::RecordCompletedTask(uint32_t character_id, const TaskInfor
 			[&](const CompletedTaskInformation& completed) { return completed.task_id == client_task.task_id; }
 		), m_completed_tasks.end());
 
-		size_t erased = m_completed_tasks.size() - before;
+		size_t erased = before - m_completed_tasks.size();
 
 		LogTasksDetail("KeepOneRecord erased [{}] elements", erased);