diff --git a/src/protocol/bittorrent/peerconnect.c b/src/protocol/bittorrent/peerconnect.c
index 4ef6a8585..d9a30913e 100644
--- a/src/protocol/bittorrent/peerconnect.c
+++ b/src/protocol/bittorrent/peerconnect.c
@@ -16,6 +16,9 @@
 #ifdef HAVE_ARPA_INET_H
 #include <arpa/inet.h>
 #endif
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h> /* socklen_t for MinGW */
+#endif
 
 #include "elinks.h"