diff --git a/lib/std/c.zig b/lib/std/c.zig
index 5f0d2dedf879bcabaa3117414d737c78a4b3aabc..53d30d80283eff673eb0f2de137e8c5e16ef604f 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -167,6 +167,18 @@ pub const timespec = switch (native_os) {
     .openbsd, .haiku => extern struct {
         sec: time_t,
         nsec: isize,
+
+        /// For use with `utimensat` and `futimens`.
+        pub const NOW: timespec = .{
+            .sec = 0, // ignored
+            .nsec = -2,
+        };
+
+        /// For use with `utimensat` and `futimens`.
+        pub const OMIT: timespec = .{
+            .sec = 0, // ignored
+            .nsec = -1,
+        };
     },
     else => void,
 };