diff --git a/libc/include/sys/epoll.h b/libc/include/sys/epoll.h
index 2bc16f5..a213a90 100644
--- a/libc/include/sys/epoll.h
+++ b/libc/include/sys/epoll.h
@@ -58,6 +58,7 @@
 int epoll_ctl(int __epoll_fd, int __op, int __fd, struct epoll_event* __event);
 int epoll_wait(int __epoll_fd, struct epoll_event* __events, int __event_count, int __timeout_ms);
 int epoll_pwait(int __epoll_fd, struct epoll_event* __events, int __event_count, int __timeout_ms, const sigset_t* __mask) __INTRODUCED_IN(21);
+int epoll_pwait64(int __epoll_fd, struct epoll_event* __events, int __event_count, int __timeout_ms, const sigset64_t* __mask) __INTRODUCED_IN(28);
 
 __END_DECLS
 
diff --git a/libc/include/sys/select.h b/libc/include/sys/select.h
index ac51d3f..603a5a6 100644
--- a/libc/include/sys/select.h
+++ b/libc/include/sys/select.h
@@ -75,6 +75,7 @@
 
 int select(int __fd_count, fd_set* __read_fds, fd_set* __write_fds, fd_set* __exception_fds, struct timeval* __timeout);
 int pselect(int __fd_count, fd_set* __read_fds, fd_set* __write_fds, fd_set* __exception_fds, const struct timespec* __timeout, const sigset_t* __mask);
+int pselect64(int __fd_count, fd_set* __read_fds, fd_set* __write_fds, fd_set* __exception_fds, const struct timespec* __timeout, const sigset64_t* __mask);
 
 __END_DECLS
 
diff --git a/libc/include/sys/signalfd.h b/libc/include/sys/signalfd.h
index 315622c..2337cd7 100644
--- a/libc/include/sys/signalfd.h
+++ b/libc/include/sys/signalfd.h
@@ -37,6 +37,7 @@
 __BEGIN_DECLS
 
 int signalfd(int __fd, const sigset_t* __mask, int __flags) __INTRODUCED_IN(18);
+int signalfd64(int __fd, const sigset64_t* __mask, int __flags) __INTRODUCED_IN(28);
 
 __END_DECLS