diff --git a/pkg/proxy/roundrobbin.go b/pkg/proxy/roundrobbin.go
index a55d812ae6d..a5474843737 100644
--- a/pkg/proxy/roundrobbin.go
+++ b/pkg/proxy/roundrobbin.go
@@ -32,10 +32,9 @@ import (
 
 // LoadBalancerRR is a round-robin load balancer.
 type LoadBalancerRR struct {
+	lock         sync.RWMutex
 	endpointsMap map[string][]string
 	rrIndex      map[string]int
-
-	lock sync.RWMutex
 }
 
 // NewLoadBalancerRR returns a new LoadBalancerRR.