From c8e232d21c163f38e6252613c66f023ad5b05a28 Mon Sep 17 00:00:00 2001
From: Sebastian <sebastian@squidex.io>
Date: Tue, 14 Apr 2020 09:29:57 +0200
Subject: [PATCH] Build fixed.

---
 backend/src/Squidex.Infrastructure/UniqueConstraintException.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/backend/src/Squidex.Infrastructure/UniqueConstraintException.cs b/backend/src/Squidex.Infrastructure/UniqueConstraintException.cs
index 96570ad79..98825ca2f 100644
--- a/backend/src/Squidex.Infrastructure/UniqueConstraintException.cs
+++ b/backend/src/Squidex.Infrastructure/UniqueConstraintException.cs
@@ -6,6 +6,7 @@
 // ==========================================================================
 
 using System;
+using System.Runtime.Serialization;
 
 namespace Squidex.Infrastructure
 {