diff --git a/cmd/filter-proxy/main.go b/cmd/filter-proxy/main.go
index 9012b7c..16a71ed 100644
--- a/cmd/filter-proxy/main.go
+++ b/cmd/filter-proxy/main.go
@@ -326,6 +326,8 @@ func authorizeRequestWithService(config *config.Config, backend config.Backend,
 		request.Header.Set("Authorization", r.Header.Get("Authorization"))
 	}
 
+	request.Header.Set("X-Forwarded-For", utils.ReadUserIP(r))
+
 	client := &http.Client{
 		Timeout: 10 * time.Second,
 	}