diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/AtlasUtilities.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/AtlasUtilities.cs
index 3e2ee015d..b6734a5eb 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/AtlasUtilities.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/AtlasUtilities.cs
@@ -372,7 +372,7 @@ namespace Spine.Unity.AttachmentTools {
 			};
 		}
 
-		protected struct BlendModeAtlasPages {
+		private struct BlendModeAtlasPages {
 			public AtlasPage normalPage;
 			public AtlasPage additivePage;
 			public AtlasPage multiplyPage;