diff --git a/BasiliskII/src/slirp/libslirp.h b/BasiliskII/src/slirp/libslirp.h
index 8a1aa31e..c955a28c 100644
--- a/BasiliskII/src/slirp/libslirp.h
+++ b/BasiliskII/src/slirp/libslirp.h
@@ -2,7 +2,16 @@
 #define _LIBSLIRP_H
 
 #ifdef _WIN32
+#ifdef __MINGW32__
+#if _WIN32_WINNT < 0x501
+#undef _WIN32_WINNT
+#define _WIN32_WINNT 0x501
+#endif
+#endif
 #include <winsock2.h>
+#ifdef __MINGW32__
+#include <WS2tcpip.h>
+#endif
 int inet_aton(const char *cp, struct in_addr *ia);
 #else
 #include <sys/select.h>
diff --git a/BasiliskII/src/slirp/slirp.h b/BasiliskII/src/slirp/slirp.h
index b845caa7..81a49dd2 100644
--- a/BasiliskII/src/slirp/slirp.h
+++ b/BasiliskII/src/slirp/slirp.h
@@ -22,8 +22,30 @@ typedef char *caddr_t;
 typedef int socklen_t;
 typedef unsigned long ioctlsockopt_t;
 
+#ifdef __MINGW32__
+#if _WIN32_WINNT < 0x501
+#undef _WIN32_WINNT
+#define _WIN32_WINNT 0x501
+#endif
+#endif
 # include <winsock2.h>
 # include <WS2tcpip.h>
+
+#ifdef __MINGW32__
+char * WSAAPI inet_ntop(
+  INT     Family,
+  PVOID  pAddr,
+  PTSTR  pStringBuf,
+  size_t StringBufSize
+);
+
+INT WSAAPI inet_pton(
+  INT     Family,
+  const char * pszAddrString,
+  PVOID  pAddrBuf
+);
+#endif
+
 # include <sys/timeb.h>
 # include <iphlpapi.h>