diff --git a/sysincl.h b/sysincl.h
index a9e4da0..e2a6e78 100644
--- a/sysincl.h
+++ b/sysincl.h
@@ -80,4 +80,8 @@
 #include <sys/random.h>
 #endif
 
+#if defined(LINUX) && !defined(IP_FREEBIND)
+#define IP_FREEBIND 15
+#endif
+
 #endif /* GOT_SYSINCL_H */
