diff --git a/libc/include/sys/select.h b/libc/include/sys/select.h
index 52315b9..9d11ee8 100644
--- a/libc/include/sys/select.h
+++ b/libc/include/sys/select.h
@@ -31,12 +31,15 @@
 #include <sys/cdefs.h>
 #include <sys/time.h>
 #include <sys/types.h>
+#include <signal.h>
 
 __BEGIN_DECLS
 
 typedef __kernel_fd_set   fd_set;
 
 extern int select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
+extern int pselect(int n, fd_set *readfds, fd_set *writefds, fd_set *errfds,
+                   const struct timespec *timeout, const sigset_t *sigmask);
 
 __END_DECLS