diff --git a/ChangeLog b/ChangeLog
index 3723685849..e6b2b5ee32 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Nov 23 16:04:05 2008  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
+
+	* signal.c (default_handler, Init_signal): compile error if
+	  USE_SIGALTSTACK is not defined.
+
 Sun Nov 23 00:04:14 2008  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
 
 	* signal.c (ALT_STACK_SIZE): 4KB is not enough on Mac OS X.
diff --git a/signal.c b/signal.c
index 0c98237f46..3ede0ec6db 100644
--- a/signal.c
+++ b/signal.c
@@ -699,7 +699,9 @@ default_handler(int sig)
 #ifdef SIGSEGV
       case SIGSEGV:
         func = sigsegv;
+#ifdef USE_SIGALTSTACK
         register_sigaltstack();
+#endif
         break;
 #endif
 #ifdef SIGPIPE
@@ -1107,7 +1109,9 @@ Init_signal(void)
     install_sighandler(SIGBUS, sigbus);
 #endif
 #ifdef SIGSEGV
+#ifdef USE_SIGALTSTACK
     register_sigaltstack();
+#endif
     install_sighandler(SIGSEGV, sigsegv);
 #endif
     }