diff --git a/src/listen.c b/src/listen.c
index 240a42b0e..9fb60edcb 100644
--- a/src/listen.c
+++ b/src/listen.c
@@ -35,6 +35,7 @@
 #include <assert.h>
 
 #ifdef WIN32
+#define WINVER 0x0501
 #include <ws2tcpip.h>
 #include <winsock.h>
 #else
diff --git a/src/socket_util.c b/src/socket_util.c
index 01733eb03..7895d3367 100644
--- a/src/socket_util.c
+++ b/src/socket_util.c
@@ -28,6 +28,7 @@
 #include <sys/socket.h>
 #include <netdb.h>
 #else /* G_OS_WIN32 */
+#define WINVER 0x0501
 #include <ws2tcpip.h>
 #include <winsock.h>
 #endif /* G_OS_WIN32 */