diff --git a/ChangeLog b/ChangeLog
index 73b4a019c1..d2fc6ee362 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun May 12 17:05:18 2013  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* signal.c (rb_f_kill): fixes typo. s/HAS_KILLPG/HAVE_KILLPG/.
+
 Sun May 12 17:03:27 2013  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* configure.in: abort if gettimeofday doesn't exist.
diff --git a/signal.c b/signal.c
index 700bd6028a..7b58840d28 100644
--- a/signal.c
+++ b/signal.c
@@ -364,7 +364,7 @@ ruby_default_signal(int sig)
 VALUE
 rb_f_kill(int argc, VALUE *argv)
 {
-#ifndef HAS_KILLPG
+#ifndef HAVE_KILLPG
 #define killpg(pg, sig) kill(-(pg), (sig))
 #endif
     int negative = 0;