diff --git a/dlls/winhttp/winhttp_private.h b/dlls/winhttp/winhttp_private.h
index 5043235..8332ac5 100644
--- a/dlls/winhttp/winhttp_private.h
+++ b/dlls/winhttp/winhttp_private.h
@@ -26,6 +26,8 @@
 #include "wine/list.h"
 #include "wine/unicode.h"
 
+#include <sys/types.h>
+
 #ifdef HAVE_NETINET_IN_H
 # include <netinet/in.h>
 #endif