--- tls/tls_config.c.orig	Fri Jul 26 22:16:53 2019
+++ tls/tls_config.c	Fri Jul 26 22:21:25 2019
@@ -15,6 +15,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef _MSC_VER
+#define NO_REDEF_POSIX_FUNCTIONS
+#endif
+
 #include <sys/stat.h>
 
 #include <ctype.h>
@@ -48,7 +52,11 @@ tls_config_load_file(struct tls_error *error, const ch
 	*buf = NULL;
 	*len = 0;
 
+#ifndef _WIN32
 	if ((fd = open(filename, O_RDONLY)) == -1) {
+#else
+	if ((fd = open(filename, O_RDONLY | O_BINARY)) == -1) {
+#endif
 		tls_error_set(error, "failed to open %s file '%s'",
 		    filetype, filename);
 		goto err;