diff --git a/src/libCom/osi/osiWireFormat.h b/src/libCom/osi/osiWireFormat.h
index 1b103d21d..a2d4537a8 100644
--- a/src/libCom/osi/osiWireFormat.h
+++ b/src/libCom/osi/osiWireFormat.h
@@ -262,6 +262,9 @@ inline void AlignedWireSet ( const T & src, T & dst )
     dst = dstu._o;
 }
 
+#define EPICS_ENDIAN_LITTLE   1234
+#define EPICS_ENDIAN_BIG      4321
+
 #include "osdWireFormat.h"
 
 #endif // osiWireFormat