diff --git a/signal.c b/signal.c
index 9b63046ec0..9220d8f1d8 100644
--- a/signal.c
+++ b/signal.c
@@ -477,7 +477,7 @@ ruby_signal(int signum, sighandler_t handler)
 #endif
 
     sigemptyset(&sigact.sa_mask);
-#ifdef SA_SIGINFO
+#ifdef USE_SIGALTSTACK
     sigact.sa_sigaction = (ruby_sigaction_t*)handler;
     sigact.sa_flags = SA_SIGINFO;
 #else