diff --git a/ChangeLog b/ChangeLog
index 7f735efe3..215684ffd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -8,6 +8,10 @@
 	* Source/NSThread.m:
 	Fix various bugs related to thread exit,  Prevent crashes at program
 	termination ...nastily obvious on mingw.
+	* Source/Additions/GSLock.m:
+	Remove -dealloc implementations which called -finalize, since the
+	superclass implementationd does that too, and finalizing twice is
+	a bad, bad thing.
 
 2009-09-07 Richard Frith-Macdonald <rfm@gnu.org>
 
diff --git a/Source/Additions/GSLock.m b/Source/Additions/GSLock.m
index c8952cb65..9fc4f37b2 100644
--- a/Source/Additions/GSLock.m
+++ b/Source/Additions/GSLock.m
@@ -73,12 +73,6 @@
   locked = -1;
 }
 
-- (void) dealloc
-{
-  [self finalize];
-  [super dealloc];
-}
-
 - (void) finalize
 {
   [[NSNotificationCenter defaultCenter] removeObserver: self];
@@ -224,12 +218,6 @@
   counter = -1;
 }
 
-- (void) dealloc
-{
-  [self finalize];
-  [super dealloc];
-}
-
 - (void) finalize
 {
   [[NSNotificationCenter defaultCenter] removeObserver: self];