diff --git a/src/ChangeLog b/src/ChangeLog
index a2a62106..1b74862d 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2005-04-08  Hrvoje Niksic  <hniksic@xemacs.org>
+
+	* ptimer.c (ptimer_diff): Fix typo affecting Windows build.
+
 2005-04-08  Hrvoje Niksic  <hniksic@xemacs.org>
 
 	* ptimer.c (ptimer_init): In fact, _POSIX_MONOTONIC_CLOCK needs to
diff --git a/src/ptimer.c b/src/ptimer.c
index 47980cfc..4fb54cf8 100644
--- a/src/ptimer.c
+++ b/src/ptimer.c
@@ -314,7 +314,7 @@ ptimer_diff (ptimer_system_time *pst1, ptimer_system_time *pst2)
 #endif
 
 #ifdef WINDOWS
-  if (using_hires_timers)
+  if (windows_hires_timers)
     return (pst1->hires.QuadPart - pst2->hires.QuadPart) / windows_hires_msfreq;
   else
     return pst1->lores - pst2->lores;