webseed-peer.go | 6 +++++-

diff --git a/webseed-peer.go b/webseed-peer.go
index cfce1e81d4b2768b9264340f28586c21b6ce2c7d..85e121194d28c22c6d3180a6d8a45cd79d7a1c80 100644
--- a/webseed-peer.go
+++ b/webseed-peer.go
@@ -124,7 +124,11 @@
 func (ws *webseedPeer) handleUpdateRequests() {
 	// Because this is synchronous, webseed peers seem to get first dibs on newly prioritized
 	// pieces.
-	ws.peer.maybeUpdateActualRequestState()
+	go func() {
+		ws.peer.t.cl.lock()
+		defer ws.peer.t.cl.unlock()
+		ws.peer.maybeUpdateActualRequestState()
+	}()
 }
 
 func (ws *webseedPeer) onClose() {