diff --git a/library/std/src/sys/unix/process/process_fuchsia.rs b/library/std/src/sys/unix/process/process_fuchsia.rs
index 6daf2885baed0..fab27cd9f7085 100644
--- a/library/std/src/sys/unix/process/process_fuchsia.rs
+++ b/library/std/src/sys/unix/process/process_fuchsia.rs
@@ -118,7 +118,8 @@ impl Command {
             FDIO_SPAWN_CLONE_JOB
                 | FDIO_SPAWN_CLONE_LDSVC
                 | FDIO_SPAWN_CLONE_NAMESPACE
-                | FDIO_SPAWN_CLONE_ENVIRON, // this is ignored when envp is non-null
+                | FDIO_SPAWN_CLONE_ENVIRON // this is ignored when envp is non-null
+                | FDIO_SPAWN_CLONE_UTC_CLOCK,
             self.get_program().as_ptr(),
             self.get_argv().as_ptr(),
             envp,
diff --git a/library/std/src/sys/unix/process/zircon.rs b/library/std/src/sys/unix/process/zircon.rs
index 750b8f0762ae5..69ec275c2b318 100644
--- a/library/std/src/sys/unix/process/zircon.rs
+++ b/library/std/src/sys/unix/process/zircon.rs
@@ -138,6 +138,7 @@ pub const FDIO_SPAWN_CLONE_LDSVC: u32 = 0x0002;
 pub const FDIO_SPAWN_CLONE_NAMESPACE: u32 = 0x0004;
 pub const FDIO_SPAWN_CLONE_STDIO: u32 = 0x0008;
 pub const FDIO_SPAWN_CLONE_ENVIRON: u32 = 0x0010;
+pub const FDIO_SPAWN_CLONE_UTC_CLOCK: u32 = 0x0020;
 pub const FDIO_SPAWN_CLONE_ALL: u32 = 0xFFFF;
 
 // fdio_spawn_etc actions