diff --git a/include/xo/unit/basis_unit_abbrev.hpp b/include/xo/unit/basis_unit_abbrev.hpp
deleted file mode 100644
index 22c8388d..00000000
--- a/include/xo/unit/basis_unit_abbrev.hpp
+++ /dev/null
@@ -1,21 +0,0 @@
-/** @file basis_unit_abbrev.hpp
- *
- *  Author: Roland Conybeare
- **/
-
-#pragma once
-
-#include "native_unit.hpp"
-#include "xo/ratio/ratio.hpp"
-//#include <cstdint>
-
-namespace xo {
-    namespace qty {
-        namespace abbrev {
-            xxx;
-        } /*namespace abbrev*/
-    } /*namespace qty*/
-} /*namespace xo*/
-
-
-/** end basis_unit_abbrev.hpp **/