diff --git a/tests/unit-test-server.c b/tests/unit-test-server.c
index 5c223ea..154d585 100644
--- a/tests/unit-test-server.c
+++ b/tests/unit-test-server.c
@@ -27,6 +27,11 @@
 # include <sys/socket.h>
 #endif
 
+/* For MinGW */
+#ifndef MSG_NOSIGNAL
+# define MSG_NOSIGNAL 0
+#endif
+
 #include "unit-test.h"
 
 enum {