diff --git a/spine-cpp/spine-cpp/include/spine/Atlas.h b/spine-cpp/spine-cpp/include/spine/Atlas.h
index 74949a74f..e720417d2 100644
--- a/spine-cpp/spine-cpp/include/spine/Atlas.h
+++ b/spine-cpp/spine-cpp/include/spine/Atlas.h
@@ -48,6 +48,7 @@ enum Format {
 };
 
 enum TextureFilter {
+	TextureFilter_Unknown,
 	TextureFilter_Nearest,
 	TextureFilter_Linear,
 	TextureFilter_MipMap,