2 files changed, 4 insertions, 2 deletions
diff --git a/libc/signal/sigaddset.c b/libc/signal/sigaddset.c
index 7e800a7f1..837f65329 100644
--- a/libc/signal/sigaddset.c
+++ b/libc/signal/sigaddset.c
@@ -30,6 +30,7 @@ sigaddset (sigset_t *set, int signo)
       return -1;
     }
 
-  return __sigaddset (set, signo);
+  __sigaddset (set, signo);
+  return 0;
 }
 libc_hidden_def(sigaddset)
diff --git a/libc/signal/sigdelset.c b/libc/signal/sigdelset.c
index de3b12ff0..9f3ab6659 100644
--- a/libc/signal/sigdelset.c
+++ b/libc/signal/sigdelset.c
@@ -29,6 +29,7 @@ int sigdelset (sigset_t *set, int signo)
       return -1;
     }
 
-  return __sigdelset (set, signo);
+  __sigdelset (set, signo);
+  return 0;
 }
 libc_hidden_def(sigdelset)