diff --git a/lib/System/Unix/Signals.inc b/lib/System/Unix/Signals.inc
index 7bd752649a4..c8ec68aab17 100644
--- a/lib/System/Unix/Signals.inc
+++ b/lib/System/Unix/Signals.inc
@@ -59,7 +59,7 @@ static const int KillSigs[] = {
 #ifdef SIGXCPU
   , SIGXCPU
 #endif
-#ifdef SIGEMT
+#ifdef SIGXFSZ
   , SIGXFSZ
 #endif
 #ifdef SIGEMT