diff --git a/internal/dnsforward/config.go b/internal/dnsforward/config.go
index 4d2924ab..4aba57ec 100644
--- a/internal/dnsforward/config.go
+++ b/internal/dnsforward/config.go
@@ -301,6 +301,8 @@ type ServerConfig struct {
 
 // UpstreamMode is a enumeration of upstream mode representations.  See
 // [proxy.UpstreamModeType].
+//
+// TODO(d.kolyshev): Consider using [proxy.UpstreamMode].
 type UpstreamMode string
 
 const (
diff --git a/internal/dnsforward/upstreams.go b/internal/dnsforward/upstreams.go
index 6fbe0638..00e10125 100644
--- a/internal/dnsforward/upstreams.go
+++ b/internal/dnsforward/upstreams.go
@@ -150,12 +150,12 @@ func setProxyUpstreamMode(
 ) (err error) {
 	switch upstreamMode {
 	case UpstreamModeParallel:
-		conf.UpstreamMode = proxy.UModeParallel
+		conf.UpstreamMode = proxy.UpstreamModeParallel
 	case UpstreamModeFastestAddr:
-		conf.UpstreamMode = proxy.UModeFastestAddr
+		conf.UpstreamMode = proxy.UpstreamModeFastestAddr
 		conf.FastestPingTimeout = fastestTimeout
 	case UpstreamModeLoadBalance:
-		conf.UpstreamMode = proxy.UModeLoadBalance
+		conf.UpstreamMode = proxy.UpstreamModeLoadBalance
 	default:
 		return fmt.Errorf("unexpected value %q", upstreamMode)
 	}