diff --git a/client/internal/pqkem/manager.go b/client/internal/pqkem/manager.go
index caa80bfab..fdfa856a0 100644
--- a/client/internal/pqkem/manager.go
+++ b/client/internal/pqkem/manager.go
@@ -335,6 +335,7 @@ func (m *Manager) Stop() {
 	m.mu.Lock()
 	m.exchanges = make(map[RemoteID]*exchangeCtl)
 	m.psks = make(map[RemoteID]PSK)
+	m.prevPSKs = make(map[RemoteID]PSK)
 	m.mu.Unlock()
 }