diff --git a/ChangeLog b/ChangeLog
index 8e49d1f8b..4a6d2ee8b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2002-05-15  Richard Frith-Macdonald <rfm@gnu.org>
+
+	* Source/NSLog.m: Altered logging format for compatibility with
+	MacOS-X (and easier collating).  Thanks to report by lcampbell
+
 2002-05-14  Richard Frith-Macdonald <rfm@gnu.org>
 
 	* Source/Unicode.m: GSFromUnicode(), GSToUnicode(), bugfix - ensure
diff --git a/Source/NSLog.m b/Source/NSLog.m
index fea502df9..e58b117f6 100644
--- a/Source/NSLog.m
+++ b/Source/NSLog.m
@@ -135,7 +135,7 @@ NSLogv (NSString* format, va_list args)
   prefix = [NSString
 	     stringWithFormat: @"%@ %@[%d] ",
 	     [[NSCalendarDate calendarDate] 
-	       descriptionWithCalendarFormat: @"%b %d %H:%M:%S"],
+	       descriptionWithCalendarFormat: @"%Y-%m-%d %H:%M:%S.%F"],
 	     [[NSProcessInfo processInfo] processName],
 	     pid];