diff --git a/misc/GNUmakefile b/misc/GNUmakefile
index fc75de5..241cd4a 100644
--- a/misc/GNUmakefile
+++ b/misc/GNUmakefile
@@ -82,7 +82,8 @@
 		--with-mail						\
 		--with-stream						\
 		--with-openssl=$(OBJS)/lib/$(OPENSSL)			\
-		--with-openssl-opt="no-asm no-tests"			\
+		--with-openssl-opt="no-asm no-tests			\
+			CFLAGS=-D_WIN32_WINNT=0x0501"			\
 		--with-http_ssl_module					\
 		--with-mail_ssl_module					\
 		--with-stream_ssl_module