diff --git a/src/bin/sudo.rs b/src/bin/sudo.rs
index ed61630a0c..647be25de4 100644
--- a/src/bin/sudo.rs
+++ b/src/bin/sudo.rs
@@ -106,7 +106,7 @@ fn main() {
         &libredox::call::dup(redox_cur_procfd_v0(), &[])
             .unwrap()
             .to_ne_bytes(),
-        syscall::CallFlags::empty(),
+        syscall::CallFlags::FD,
         &[],
     )
     .unwrap();