diff --git a/libc/calls/weirdtypes.h b/libc/calls/weirdtypes.h
index 8fc13707e..20c0ff440 100644
--- a/libc/calls/weirdtypes.h
+++ b/libc/calls/weirdtypes.h
@@ -30,6 +30,7 @@
 #define socklen_t     uint32_t
 #define speed_t       uint32_t
 #define suseconds_t   int64_t /* int32_t on xnu */
+#define useconds_t    uint64_t /* uint32_t on xnu */
 #define syscall_arg_t int64_t /* uint64_t on xnu */
 #define tcflag_t      uint32_t
 #define time_t        int64_t