diff --git a/graph/graph.go b/graph/graph.go
index 911924f..a5139e6 100644
--- a/graph/graph.go
+++ b/graph/graph.go
@@ -3,6 +3,7 @@
 import (
 	"context"
 	"fmt"
+	"sync"
 
 	"github.com/digitalocean/go-netbox/netbox/client"
 	"github.com/digitalocean/go-netbox/netbox/client/dcim"
@@ -41,6 +42,7 @@
 type Graph struct {
 	Switches map[string]*Switch
 	Machines map[string]*Machine
+	Mu       sync.RWMutex
 }
 
 func New() *Graph {