diff --git a/kitty/child-monitor.c b/kitty/child-monitor.c
index 0f0391dfd..1baf36bf5 100644
--- a/kitty/child-monitor.c
+++ b/kitty/child-monitor.c
@@ -139,6 +139,8 @@ mask_variadic_signals(int sentinel, ...) {
     }
     va_end(valist);
     sigprocmask(SIG_BLOCK, &signals, NULL);
+#else
+    (void)sentinel;
 #endif
 }