diff --git a/tstest/integration/testcontrol/testcontrol.go b/tstest/integration/testcontrol/testcontrol.go
index 847f66de7..bbcf277d1 100644
--- a/tstest/integration/testcontrol/testcontrol.go
+++ b/tstest/integration/testcontrol/testcontrol.go
@@ -366,6 +366,7 @@ func (s *Server) serveMachine(w http.ResponseWriter, r *http.Request) {
 func (s *Server) SetSubnetRoutes(nodeKey key.NodePublic, routes []netip.Prefix) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
+	s.logf("Setting subnet routes for %s: %v", nodeKey.ShortString(), routes)
 	mak.Set(&s.nodeSubnetRoutes, nodeKey, routes)
 }