diff --git a/lib/normalize_client_ip_middleware.rb b/lib/normalize_client_ip_middleware.rb
index 41be3377..5e382856 100644
--- a/lib/normalize_client_ip_middleware.rb
+++ b/lib/normalize_client_ip_middleware.rb
@@ -6,9 +6,16 @@ class NormalizeClientIpMiddleware
   end
 
   def call(env)
-    if env['HTTP_CLIENT_IP'].present? && env['HTTP_X_CLIENT_IP'].present? &&
-       env['HTTP_CLIENT_IP'].starts_with?("#{env['HTTP_X_CLIENT_IP']}:")
-      env['HTTP_CLIENT_IP'] = env['HTTP_X_CLIENT_IP']
+    if env['HTTP_CLIENT_IP'].present?
+      if env['HTTP_X_CLIENT_IP'].present? &&
+         env['HTTP_CLIENT_IP'].starts_with?("#{env['HTTP_X_CLIENT_IP']}:")
+        env['HTTP_CLIENT_IP'] = env['HTTP_X_CLIENT_IP']
+      end
+
+      if env['HTTP_X_FORWARDED_FOR'].present? &&
+         env['HTTP_X_FORWARDED_FOR'].sub(/:\d+\z/, '') == env['HTTP_CLIENT_IP']
+        env['HTTP_X_FORWARDED_FOR'] = env['HTTP_CLIENT_IP']
+      end
     end
 
     @app.call(env)