diff --git a/libvncclient/sasl.c b/libvncclient/sasl.c
index db240c1..b533adb 100644
--- a/libvncclient/sasl.c
+++ b/libvncclient/sasl.c
@@ -38,6 +38,10 @@
 #include <errno.h>
 #include <rfb/rfbclient.h>
 
+#if LIBVNCSERVER_HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+
 #ifdef WIN32
 #undef SOCKET
 #include <winsock2.h>