diff --git a/libobjc/ChangeLog b/libobjc/ChangeLog
index b292188c690..8ded8934041 100644
--- a/libobjc/ChangeLog
+++ b/libobjc/ChangeLog
@@ -1,3 +1,7 @@
+Thu Sep 23 07:19:12 1999   Chris Ball <cball@fmco.com>
+
+	* thr-posix.c (__objc_mutex_deallocate): made deallocate work.
+
 Tue Sep 21 07:47:10 1999  Jeffrey A Law  (law@cygnus.com)
 
 	* Makefile.in (gc.o, gc_gc.o): Do not pass -fgnu-runtime to
diff --git a/libobjc/thr-posix.c b/libobjc/thr-posix.c
index 5b40f711be8..a73c6277791 100644
--- a/libobjc/thr-posix.c
+++ b/libobjc/thr-posix.c
@@ -145,6 +145,20 @@ __objc_mutex_allocate(objc_mutex_t mutex)
 int
 __objc_mutex_deallocate(objc_mutex_t mutex)
 {
+  int count = 1;
+
+  /*
+   * Posix Threads specifically require that the thread be unlocked for
+   * pthread_mutex_destroy to work.
+   */
+
+  while ( count )
+    {
+      if (( count = pthread_mutex_unlock((pthread_mutex_t *)mutex->backend))
+          < 0 )
+        return -1;
+    }
+
   if (pthread_mutex_destroy((pthread_mutex_t *)mutex->backend))
     return -1;