diff --git a/p2p/discover/api.go b/p2p/discover/api.go
index d39702d9f5..1e06068404 100644
--- a/p2p/discover/api.go
+++ b/p2p/discover/api.go
@@ -103,6 +103,8 @@ func (d *DiscV5API) AddEnr(enr string) (bool, error) {
 	}
 
 	// immediately add the node to the routing table
+	d.DiscV5.tab.mutex.Lock()
+	defer d.DiscV5.tab.mutex.Unlock()
 	d.DiscV5.tab.handleAddNode(addNodeOp{node: n, isInbound: false, forceSetLive: true})
 	return true, nil
 }
diff --git a/p2p/discover/portal_protocol.go b/p2p/discover/portal_protocol.go
index baef3b17fe..670a2f48fa 100644
--- a/p2p/discover/portal_protocol.go
+++ b/p2p/discover/portal_protocol.go
@@ -288,6 +288,8 @@ func (p *PortalProtocol) RoutingTableInfo() [][]string {
 
 func (p *PortalProtocol) AddEnr(n *enode.Node) {
 	// immediately add the node to the routing table
+	p.table.mutex.Lock()
+	defer p.table.mutex.Unlock()
 	p.table.handleAddNode(addNodeOp{node: n, isInbound: false, forceSetLive: true})
 	id := n.ID().String()
 	p.radiusCache.Set([]byte(id), MaxDistance)