diff --git a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/Editor/Utils.cs b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/Editor/Utils.cs
index 6a3887b..3dcaea8 100644
--- a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/Editor/Utils.cs
+++ b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/Editor/Utils.cs
@@ -1,4 +1,6 @@
+#if UNITY_2018_3_OR_NEWER
 using UnityEditor.Experimental.SceneManagement;
+#endif
 using UnityEditor.SceneManagement;
 
 
diff --git a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/Editor/Utils.cs.meta b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/Editor/Utils.cs.meta
new file mode 100644
index 0000000..e16b794
--- /dev/null
+++ b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/Editor/Utils.cs.meta
@@ -0,0 +1,11 @@
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