diff --git a/ChangeLog b/ChangeLog
index cc2bec196..25d7ba8f4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,6 +4,8 @@
 	* Source/NSCalendarDate.m: Tidy up a little.
 	* Source/NSTimeZone.m: Rewrite main timezone code for performance -
 	Roughly doubles speed of most NSCalendarDate stuff.
+	* NSThread.m: Fix for single threaded operation ... suggested by
+	Ludovic Marcotte.
 
 2002-09-29  Richard Frith-Macdonald <rfm@gnu.org>
 
diff --git a/Source/NSThread.m b/Source/NSThread.m
index ecf4f1096..0759fbfd7 100644
--- a/Source/NSThread.m
+++ b/Source/NSThread.m
@@ -249,8 +249,9 @@ gnustep_base_thread_callback()
    */
   if (objc_thread_detach(@selector(_sendThreadMethod), thread, nil) == NULL)
     {
-      /* This should probably be an exception */
-      NSLog(@"Unable to detach thread (unknown error)");
+      entered_multi_threaded_state = NO;
+      [NSException raise: NSInternalInconsistencyException
+		  format: @"Unable to detach thread (unknown error)"];
     }
 }