diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index b415b261eed..d8740bd3087 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,9 @@
+2004-11-08  Benjamin Kosnik  <bkoz@redhat.com>
+	    Doug Gregor  <dgregor@cs.indiana.edu>
+
+	PR libstdc++/17664
+	* src/debug.cc : Just use one mutex.
+
 2004-11-08  Benjamin Kosnik  <bkoz@redhat.com>
 
 	* configure.ac (libtool_VERSION): To 6:4:0.
@@ -118,7 +124,7 @@
 2004-11-02  Benjamin Kosnik  <bkoz@redhat.com>
   	    Lothar Werzinger  <lothar@xcerla.com>
 	
-	PR libstdc++/17627
+	PR libstdc++/17664
 	* src/debug.cc: Include concurrence, use mutexes.
 	(_Safe_iterator_base::_M_attach): Here.	
 	(_Safe_iterator_base::_M_detach): Here.	
diff --git a/libstdc++-v3/src/debug.cc b/libstdc++-v3/src/debug.cc
index fe6bba45fc3..415fcbf91c1 100644
--- a/libstdc++-v3/src/debug.cc
+++ b/libstdc++-v3/src/debug.cc
@@ -43,9 +43,7 @@ using namespace std;
 
 namespace __gnu_internal
 {
-  __glibcxx_mutex_define_initialized(iterator_base_attach_mutex);
-  __glibcxx_mutex_define_initialized(iterator_base_detach_mutex);
-
+  __glibcxx_mutex_define_initialized(iterator_base_mutex);
 } // namespace __gnu_internal
 
 namespace __gnu_debug
@@ -196,7 +194,7 @@ namespace __gnu_debug
     // Attach to the new sequence (if there is one)
     if (__seq)
       {
-	__gnu_cxx::lock sentry(__gnu_internal::iterator_base_attach_mutex);
+	__gnu_cxx::lock sentry(__gnu_internal::iterator_base_mutex);
 	_M_sequence = __seq;
 	_M_version = _M_sequence->_M_version;
 	_M_prior = 0;
@@ -221,7 +219,7 @@ namespace __gnu_debug
   _Safe_iterator_base::
   _M_detach()
   {
-    __gnu_cxx::lock sentry(__gnu_internal::iterator_base_detach_mutex);
+    __gnu_cxx::lock sentry(__gnu_internal::iterator_base_mutex);
     if (_M_sequence)
       {
 	// Remove us from this sequence's list