diff --git a/libc/include/sys/linux-unistd.h b/libc/include/sys/linux-unistd.h
index 789271e..12f7704 100644
--- a/libc/include/sys/linux-unistd.h
+++ b/libc/include/sys/linux-unistd.h
@@ -171,6 +171,7 @@
 int              getsockopt (int, int, int, void *, socklen_t *);
 int              sendmsg (int, const struct msghdr *, unsigned int);
 int              recvmsg (int, struct msghdr *, unsigned int);
+int              __socketcall (int, unsigned long*);
 int              sched_setscheduler (pid_t pid, int policy, const struct sched_param *param);
 int              sched_getscheduler (pid_t pid);
 int              sched_yield (void);