diff --git a/stb_rect_pack.h b/stb_rect_pack.h
index 373b105..76a02cb 100644
--- a/stb_rect_pack.h
+++ b/stb_rect_pack.h
@@ -1,4 +1,4 @@
-// stb_rect_pack.h - v0.02 - public domain - rectangle packing
+// stb_rect_pack.h - v0.03 - public domain - rectangle packing
 // Sean Barrett 2014
 //
 // Useful for e.g. packing rectangular textures into an atlas.
@@ -29,6 +29,8 @@
 #ifndef STB_INCLUDE_STB_RECT_PACK_H
 #define STB_INCLUDE_STB_RECT_PACK_H
 
+#define STB_RECT_PACK_VERSION  1
+
 #ifdef STBRP_STATIC
 #define STBRP_DEF static
 #else