diff --git a/spine-c/include/spine/Atlas.h b/spine-c/include/spine/Atlas.h
index 4f038db3d..ffb47322a 100644
--- a/spine-c/include/spine/Atlas.h
+++ b/spine-c/include/spine/Atlas.h
@@ -85,6 +85,7 @@ void spAtlasPage_dispose (spAtlasPage* self);
 
 #ifdef SPINE_SHORT_NAMES
 typedef spAtlasFormat AtlasFormat;
+#define ATLAS_UNKNOWN_FORMAT SP_ATLAS_UNKNOWN_FORMAT
 #define ATLAS_ALPHA SP_ATLAS_ALPHA
 #define ATLAS_INTENSITY SP_ATLAS_INTENSITY
 #define ATLAS_LUMINANCE_ALPHA SP_ATLAS_LUMINANCE_ALPHA
@@ -93,6 +94,7 @@ typedef spAtlasFormat AtlasFormat;
 #define ATLAS_RGB888 SP_ATLAS_RGB888
 #define ATLAS_RGBA8888 SP_ATLAS_RGBA8888
 typedef spAtlasFilter AtlasFilter;
+#define ATLAS_UNKNOWN_FILTER SP_ATLAS_UNKNOWN_FILTER
 #define ATLAS_NEAREST SP_ATLAS_NEAREST
 #define ATLAS_LINEAR SP_ATLAS_LINEAR
 #define ATLAS_MIPMAP SP_ATLAS_MIPMAP