diff --git a/bootstrap/src/procmgr.rs b/bootstrap/src/procmgr.rs
index f69c0a4115..42238072ec 100644
--- a/bootstrap/src/procmgr.rs
+++ b/bootstrap/src/procmgr.rs
@@ -2333,7 +2333,7 @@ impl<'a> ProcScheme<'a> {
                                 continue;
                             };
                             log::trace!("TCTL {:#x?}", &**tctl);
-                            if (tctl.word[sig_group].load(Ordering::Relaxed) >> 32) & sig_bit(sig)
+                            if (tctl.word[sig_group].load(Ordering::Relaxed) >> 32) & (1 << sig_idx)
                                 != 0
                             {
                                 thread