diff --git a/libc/include/sys/un.h b/libc/include/sys/un.h
index 973861f10..f89ead313 100644
--- a/libc/include/sys/un.h
+++ b/libc/include/sys/un.h
@@ -28,6 +28,9 @@
 #ifndef _SYS_UN_H_
 #define _SYS_UN_H_
 
+#include <sys/_types.h>
+typedef __sa_family_t sa_family_t;
+
 #include <linux/un.h>
 
 #endif /* _SYS_UN_H_ */