diff --git a/tailcfg/derpmap.go b/tailcfg/derpmap.go
index 6abc63695..7114ac9e7 100644
--- a/tailcfg/derpmap.go
+++ b/tailcfg/derpmap.go
@@ -14,6 +14,10 @@ type DERPMap struct {
 	//
 	// The numbers are not necessarily contiguous.
 	Regions map[int]*DERPRegion
+
+	// OmitDefaultRegions specifies to not use Tailscale's DERP servers, and only use those
+	// specified in this DERPMap. If there are none set outside of the defaults, this is a noop.
+	OmitDefaultRegions bool `json:"omitDefaultRegions,omitempty"`
 }
 
 /// RegionIDs returns the sorted region IDs.
diff --git a/tailcfg/tailcfg_clone.go b/tailcfg/tailcfg_clone.go
index c4701eaf2..0594d5aa4 100644
--- a/tailcfg/tailcfg_clone.go
+++ b/tailcfg/tailcfg_clone.go
@@ -309,7 +309,8 @@ func (src *DERPMap) Clone() *DERPMap {
 // A compilation failure here means this code must be regenerated, with command:
 //   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Login,DNSConfig,DNSResolver,RegisterResponse,DERPRegion,DERPMap,DERPNode
 var _DERPMapNeedsRegeneration = DERPMap(struct {
-	Regions map[int]*DERPRegion
+	Regions            map[int]*DERPRegion
+	OmitDefaultRegions bool
 }{})
 
 // Clone makes a deep copy of DERPNode.