diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 0a2e1ec3..4f624ffb 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -177,9 +177,7 @@ int rmdir(const char*);
 unsigned sleep(unsigned);
 int truncate(const char*, off_t);
 int truncateat(int dirfd, const char*, off_t);
-#if __POSIX_OBSOLETE <= 200112 || defined(_SORTIX_SOURCE)
 int usleep(useconds_t useconds);
-#endif
 int unlinkat(int, const char*, int);
 int unlink(const char*);
 ssize_t write(int, const void*, size_t);