diff --git a/libdap-cuttdb/src/mman.h b/libdap-cuttdb/src/mman.h
index b8bb8cb78d0fdf69037399dd5d2845b857e08624..78c243e2f7cdaa2a698d197339633d7723b4da7c 100644
--- a/libdap-cuttdb/src/mman.h
+++ b/libdap-cuttdb/src/mman.h
@@ -1,9 +1,5 @@
 #ifndef _MMAN_H_
-#define _MMAN_H_
-
-#ifndef _WIN32_WINNT
-#define _WIN32_WINNT 0x0600
-#endif						
+#define _MMAN_H_					
 
 #include <_mingw.h>
 #include <stdint.h>