diff --git a/dlls/winhttp/request.c b/dlls/winhttp/request.c
index 3449ce6b4e3..b0b81f0dc9d 100644
--- a/dlls/winhttp/request.c
+++ b/dlls/winhttp/request.c
@@ -24,6 +24,9 @@
 #ifdef HAVE_ARPA_INET_H
 # include <arpa/inet.h>
 #endif
+#ifdef HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
 
 #include "windef.h"
 #include "winbase.h"