diff --git a/ChangeLog b/ChangeLog
index 3a71f556..1d294aab 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-04-12  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Fixed compile error on Mac OS X
+	* src/TimerA2.h
+
 2010-04-12  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Added warning for the system which lacks clock_gettime with
diff --git a/src/TimerA2.h b/src/TimerA2.h
index c0824d8c..9166d5b1 100644
--- a/src/TimerA2.h
+++ b/src/TimerA2.h
@@ -44,7 +44,7 @@ class Timer {
 private:
   timeval _tv;
 
-  int64_t difference(const struct timeval& tv) const;
+  time_t difference(const struct timeval& tv) const;
 
   int64_t differenceInMillis(const struct timeval& tv) const;
 public: