diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 18fbe843db72..a6ff6266e063 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,7 @@
+2009-11-29  Jonathan Wakely  <jwakely.gcc@gmail.com>
+
+	* doc/doxygen/user.cfg.in: Add __GXX_RTTI to PREDEFINED macros.
+
 2009-11-20  Jonathan Wakely  <jwakely.gcc@gmail.com>
 
 	PR libstdc++/42019
diff --git a/libstdc++-v3/doc/doxygen/user.cfg.in b/libstdc++-v3/doc/doxygen/user.cfg.in
index be32ecbb3216..649b84d37977 100644
--- a/libstdc++-v3/doc/doxygen/user.cfg.in
+++ b/libstdc++-v3/doc/doxygen/user.cfg.in
@@ -1449,6 +1449,7 @@ PREDEFINED             = __cplusplus \
                          _GLIBCXX_ATOMIC_BUILTINS_8 \
                          _GLIBCXX_USE_SCHED_YIELD \
                          _GLIBCXX_USE_NANOSLEEP \
+                         __GXX_RTTI \
                          __glibcxx_function_requires=// \
                          __glibcxx_class_requires=// \
                          __glibcxx_class_requires2=// \