diff --git a/framework/src/Volo.Abp.Settings/Volo/Abp/Settings/ISettingDefinitionContext.cs b/framework/src/Volo.Abp.Settings/Volo/Abp/Settings/ISettingDefinitionContext.cs
index 0454bb0cae..59d7acda98 100644
--- a/framework/src/Volo.Abp.Settings/Volo/Abp/Settings/ISettingDefinitionContext.cs
+++ b/framework/src/Volo.Abp.Settings/Volo/Abp/Settings/ISettingDefinitionContext.cs
@@ -1,4 +1,6 @@
-namespace Volo.Abp.Settings
+using System.Collections.Generic;
+
+namespace Volo.Abp.Settings
 {
     public interface ISettingDefinitionContext
     {