diff --git a/ChangeLog b/ChangeLog
index 8cdf7c6152..2a232ce931 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Nov  8 23:30:21 2011  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* addr2line.c (PATH_MAX): define if not defined. [ruby-core:40840]
+
 Tue Nov  8 23:26:49 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/tk/tcltklib.c (rb_thread_critical): fix type.
diff --git a/addr2line.c b/addr2line.c
index 219d1d4b47..961fca8577 100644
--- a/addr2line.c
+++ b/addr2line.c
@@ -68,6 +68,9 @@
 #  define ElfW(x) Elf32##_##x
 # endif
 #endif
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
 
 typedef struct {
     const char *dirname;