diff --git a/ChangeLog b/ChangeLog
index 4f4ab35b89..1eefb3c10a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Jan 30 17:19:46 2011  Tanaka Akira  <akr@fsij.org>
+
+	* missing/langinfo.c: parenthesize macro arguments.
+
 Mon Jan 31 21:57:39 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* configure.in: revert r30698.
diff --git a/missing/langinfo.c b/missing/langinfo.c
index 594fe1fcf1..143ee0e820 100644
--- a/missing/langinfo.c
+++ b/missing/langinfo.c
@@ -56,7 +56,7 @@
 #endif
 
 #define digit(x) ((x) >= '0' && (x) <= '9')
-#define strstart(s, n) (strncasecmp(s, n, strlen(n)) == 0)
+#define strstart(s, n) (strncasecmp((s), (n), strlen(n)) == 0)
 
 static char buf[16];