diff --git a/win32/inet.h b/win32/inet.h
index 7b3821c71bc..e58083828f4 100644
--- a/win32/inet.h
+++ b/win32/inet.h
@@ -3,7 +3,7 @@
 #endif
 #include <Ws2tcpip.h>
 
-#if (_WIN32_WINNT <= 0x500)
+#if (_WIN32_WINNT < 0x0600)
 PHPAPI int inet_pton(int af, const char* src, void* dst);
 PHPAPI const char* inet_ntop(int af, const void* src, char* dst, size_t size);
 PHPAPI int inet_aton(const char *cp, struct in_addr *inp);