diff --git a/libc/include/bits/signal.h b/libc/include/bits/signal.h
index 16a0441e..b1803235 100644
--- a/libc/include/bits/signal.h
+++ b/libc/include/bits/signal.h
@@ -49,8 +49,9 @@ enum __signals
     SIGPIPE = 13,
     SIGALRM = 14,
     SIGTERM = 15,
-    SIGTTIN = 16,
-    SIGTTOU = 17,
+    SIGTTIN,
+    SIGTTOU,
+    SIGWINCH,
     // FIXME: Add the remaining signals.
     __NSIG,
 };