diff --git a/libdap-cuttdb/src/mman.h b/libdap-cuttdb/src/mman.h
index b8bb8cb78d0fdf69037399dd5d2845b857e08624..7367f3d4cfa4a37ff423e6202cfb4d79d6058c8e 100644
--- a/libdap-cuttdb/src/mman.h
+++ b/libdap-cuttdb/src/mman.h
@@ -1,10 +1,6 @@
 #ifndef _MMAN_H_
 #define _MMAN_H_
 
-#ifndef _WIN32_WINNT
-#define _WIN32_WINNT 0x0600
-#endif						
-
 #include <_mingw.h>
 #include <stdint.h>
 #include <io.h>