diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 167faa82cc86..6e817284d361 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,7 @@
+2004-12-24  Paolo Carlini  <pcarlini@suse.de>
+
+	* include/tr1/type_traits: Add missing undef.
+
 2004-12-24  Paolo Carlini  <pcarlini@suse.de>
 
 	* include/tr1/type_traits: Implement is_member_object_pointer,
diff --git a/libstdc++-v3/include/tr1/type_traits b/libstdc++-v3/include/tr1/type_traits
index 4da6b3ca1786..42f9bac6af41 100644
--- a/libstdc++-v3/include/tr1/type_traits
+++ b/libstdc++-v3/include/tr1/type_traits
@@ -370,6 +370,7 @@ namespace tr1
 #undef _DEFINE_SPEC_0_HELPER
 #undef _DEFINE_SPEC_1_HELPER
 #undef _DEFINE_SPEC_2_HELPER
+#undef _DEFINE_SPEC
 #undef _DEFINE_SPEC_1_VAR
 #undef _DEFINE_SPEC_2_VAR