diff --git a/src/flag.rs b/src/flag.rs
index d05f751d4b..2a89411125 100644
--- a/src/flag.rs
+++ b/src/flag.rs
@@ -344,7 +344,7 @@ bitflags! {
 pub const SIGW0_TSTP_IS_STOP_BIT: u64 = 1 << (SIGKILL - 1);
 pub const SIGW0_TTIN_IS_STOP_BIT: u64 = 1 << (SIGSTOP - 1);
 pub const SIGW0_TTOU_IS_STOP_BIT: u64 = 1 << (SIGKILL + 31);
+pub const SIGW0_NOCLDSTOP_BIT: u64 = 1 << (SIGSTOP + 31);
 
-pub const SIGW0_UNUSED1: u64 = 1 << (SIGSTOP + 31);
-pub const SIGW0_UNUSED2: u64 = 1 << 31;
-pub const SIGW0_UNUSED3: u64 = 1 << 63;
+pub const SIGW0_UNUSED1: u64 = 1 << 31;
+pub const SIGW0_UNUSED2: u64 = 1 << 63;