diff --git a/ChangeLog b/ChangeLog
index 10891e0919..9740541e62 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Feb 27 03:55:45 2014  Zachary Scott  <e@zzak.io>
+
+	* thread.c: [DOC] Typo in comment for _FORTIFY_SOURCE [Fixes GH-548]
+	  Patch by @qnet-herwin https://github.com/ruby/ruby/pull/548
+
 Wed Feb 26 18:43:43 2014  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c (heap_pages_free_unused_pages): check tomb page availability
diff --git a/thread.c b/thread.c
index 73261be711..43fec8ace1 100644
--- a/thread.c
+++ b/thread.c
@@ -49,7 +49,7 @@
  * supports large fd size (>FD_SETSIZE), it wrongly assumes fd is always
  * less than FD_SETSIZE (i.e. 1024). And then when enabling HAVE_RB_FD_INIT,
  * it doesn't work correctly and makes program abort. Therefore we need to
- * disable FORTY_SOURCE until glibc fixes it.
+ * disable FORTIFY_SOURCE until glibc fixes it.
  */
 #undef _FORTIFY_SOURCE
 #undef __USE_FORTIFY_LEVEL