diff --git a/xs/src/avrdude/ser_win32.c b/xs/src/avrdude/ser_win32.c
index 20d085d13..3a05cfa90 100644
--- a/xs/src/avrdude/ser_win32.c
+++ b/xs/src/avrdude/ser_win32.c
@@ -311,8 +311,10 @@ static int ser_open(char * port, union pinfo pinfo, union filedescriptor *fdp)
 static void ser_close(union filedescriptor *fd)
 {
 	if (serial_over_ethernet) {
+#ifdef HAVE_LIBWS2_32
 		closesocket(fd->ifd);
 		WSACleanup();
+#endif
 	} else {
 		HANDLE hComPort=(HANDLE)fd->pfd;
 		if (hComPort != INVALID_HANDLE_VALUE)