diff --git a/endpoint/endpoint.go b/endpoint/endpoint.go
index c49f2b7b0..7df3f882f 100644
--- a/endpoint/endpoint.go
+++ b/endpoint/endpoint.go
@@ -164,8 +164,9 @@ type ProviderSpecific []ProviderSpecificProperty
 
 // EndpointKey is the type of a map key for separating endpoints or targets.
 type EndpointKey struct {
-	DNSName    string
-	RecordType string
+	DNSName       string
+	RecordType    string
+	SetIdentifier string
 }
 
 // Endpoint is a high-level way of a connection between a service and an IP
@@ -267,6 +268,15 @@ func (e *Endpoint) DeleteProviderSpecificProperty(key string) {
 	}
 }
 
+// Key returns the EndpointKey of the Endpoint.
+func (e *Endpoint) Key() EndpointKey {
+	return EndpointKey{
+		DNSName:       e.DNSName,
+		RecordType:    e.RecordType,
+		SetIdentifier: e.SetIdentifier,
+	}
+}
+
 func (e *Endpoint) String() string {
 	return fmt.Sprintf("%s %d IN %s %s %s %s", e.DNSName, e.RecordTTL, e.RecordType, e.SetIdentifier, e.Targets, e.ProviderSpecific)
 }