diff --git a/Editor/Editors/TriScriptedImporterEditor.cs b/Editor/Editors/TriScriptedImporterEditor.cs
index f71a07c..f5a977f 100644
--- a/Editor/Editors/TriScriptedImporterEditor.cs
+++ b/Editor/Editors/TriScriptedImporterEditor.cs
@@ -1,8 +1,13 @@
 using TriInspectorUnityInternalBridge;
 using UnityEditor;
-using UnityEditor.AssetImporters;
 using UnityEngine.UIElements;
 
+#if UNITY_2020_2_OR_NEWER
+using UnityEditor.AssetImporters;
+#else
+using UnityEditor.Experimental.AssetImporters;
+#endif
+
 namespace TriInspector.Editors
 {
     [CanEditMultipleObjects]
diff --git a/Editor/Elements/TriBoxGroupElement.cs b/Editor/Elements/TriBoxGroupElement.cs
index 9952856..0171153 100644
--- a/Editor/Elements/TriBoxGroupElement.cs
+++ b/Editor/Elements/TriBoxGroupElement.cs
@@ -18,7 +18,7 @@ namespace TriInspector.Elements
         private bool _expanded;
 
         [Serializable]
-        public struct Props
+        public new struct Props
         {
             public string title;
             public TitleMode titleMode;
diff --git a/Unity.InternalAPIEditorBridge.012/ReorderableListProxy.cs b/Unity.InternalAPIEditorBridge.012/ReorderableListProxy.cs
index 644c475..c7dd465 100644
--- a/Unity.InternalAPIEditorBridge.012/ReorderableListProxy.cs
+++ b/Unity.InternalAPIEditorBridge.012/ReorderableListProxy.cs
@@ -63,7 +63,11 @@ namespace TriInspectorUnityInternalBridge
 
         public static void DoAddButton(ReorderableList list, Object value)
         {
+#if UNITY_2020_2_OR_NEWER
             defaultBehaviours.DoAddButton(list, value);
+#else
+            defaultBehaviours.DoAddButton(list);
+#endif
         }
     }
 }
\ No newline at end of file