diff --git a/pex_reactor.go b/pex_reactor.go
index c02d9a67..ed0ab76e 100644
--- a/pex_reactor.go
+++ b/pex_reactor.go
@@ -42,12 +42,14 @@ func NewPEXReactor(book *AddrBook) *PEXReactor {
 
 func (pexR *PEXReactor) OnStart() error {
 	pexR.BaseReactor.OnStart()
+	pexR.book.OnStart()
 	go pexR.ensurePeersRoutine()
 	return nil
 }
 
 func (pexR *PEXReactor) OnStop() {
 	pexR.BaseReactor.OnStop()
+	pexR.book.OnStop()
 }
 
 // Implements Reactor