diff --git a/.DEREK.yml b/.DEREK.yml
new file mode 100644
index 0000000..8f544aa
--- /dev/null
+++ b/.DEREK.yml
@@ -0,0 +1 @@
+redirect: https://raw.githubusercontent.com/openfaas/faas/master/.DEREK.yml
diff --git a/handlers/replicas.go b/handlers/replicas.go
index a9ce937..4af805e 100644
--- a/handlers/replicas.go
+++ b/handlers/replicas.go
@@ -85,6 +85,8 @@ func MakeReplicaReader(client rancher.BridgeClient) VarsHandler {
 			return
 		}
 
+		found.AvailableReplicas = found.Replicas
+
 		functionBytes, _ := json.Marshal(found)
 		w.Header().Set("Content-Type", "application/json")
 		w.WriteHeader(200)
diff --git a/vendor/github.com/alexellis/faas/gateway/requests/requests.go b/vendor/github.com/alexellis/faas/gateway/requests/requests.go
index 0701fbd..4d1dfa4 100644
--- a/vendor/github.com/alexellis/faas/gateway/requests/requests.go
+++ b/vendor/github.com/alexellis/faas/gateway/requests/requests.go
@@ -60,6 +60,9 @@ type Function struct {
 	InvocationCount float64 `json:"invocationCount"` // TODO: shouldn't this be int64?
 	Replicas        uint64  `json:"replicas"`
 	EnvProcess      string  `json:"envProcess"`
+
+	// AvailableReplicas is the count of replicas ready to receive invocations as reported by the back-end
+	AvailableReplicas uint64 `json:"availableReplicas"`
 }
 
 // AsyncReport is the report from a function executed on a queue worker.