diff --git a/gcc/ada/gsocket.h b/gcc/ada/gsocket.h
index e7284a1ef4e5..561f2ffb5662 100644
--- a/gcc/ada/gsocket.h
+++ b/gcc/ada/gsocket.h
@@ -80,12 +80,6 @@
 #define FD_SETSIZE 1024
 
 #ifdef __MINGW32__
-/* winsock2.h allows WSAPoll related definitions only when
- * _WIN32_WINNT >= 0x0600 */
-#if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600
-#define _WIN32_WINNT 0x0600
-#endif
-
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #include <versionhelpers.h>
diff --git a/gcc/ada/mingw32.h b/gcc/ada/mingw32.h
index a190d51076f5..d038211a1dc1 100644
--- a/gcc/ada/mingw32.h
+++ b/gcc/ada/mingw32.h
@@ -44,11 +44,6 @@
 #define UNICODE  /* For Win32 API */
 #endif
 
-/* We need functionality available only starting with Windows XP */
-#ifndef _WIN32_WINNT
-#define _WIN32_WINNT 0x0501
-#endif
-
 #ifndef __CYGWIN__
 #include <tchar.h>
 #endif