diff --git a/lib/core-net/private.h b/lib/core-net/private.h
index 598c87355..d2168d817 100644
--- a/lib/core-net/private.h
+++ b/lib/core-net/private.h
@@ -26,7 +26,6 @@
 
 #ifdef LWS_WITH_IPV6
 #if defined(WIN32) || defined(_WIN32)
-#include <wincrypt.h>
 #include <iphlpapi.h>
 #else
 #include <net/if.h>
diff --git a/lib/plat/windows/private.h b/lib/plat/windows/private.h
index 5b1b88780..a7756d842 100644
--- a/lib/plat/windows/private.h
+++ b/lib/plat/windows/private.h
@@ -25,7 +25,7 @@
   #define WIN32_LEAN_AND_MEAN
  #endif
 
- #if (WINVER < 0x0501)
+ #if defined(WINVER) && (WINVER < 0x0501)
   #undef WINVER
   #undef _WIN32_WINNT
   #define WINVER 0x0501