diff --git a/dwarves.h b/dwarves.h
index 52d162d..2132da0 100644
--- a/dwarves.h
+++ b/dwarves.h
@@ -1390,4 +1390,8 @@ extern bool no_bitfield_type_recode;
 
 extern const char tabs[];
 
+#ifndef DW_TAG_skeleton_unit
+#define DW_TAG_skeleton_unit 0x4a
+#endif
+
 #endif /* _DWARVES_H_ */