diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index a4576d4f8ad8..647241488f1b 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,7 @@
+2009-08-14  Uros Bizjak  <ubizjak@gmail.com>
+
+	* src/compatibility-ldbl.cc: Include cmath.
+
 2009-08-13  Benjamin Kosnik  <bkoz@redhat.com>
 
 	* src/compatibility-ldbl.cc: Include tr1/functional.
diff --git a/libstdc++-v3/src/compatibility-ldbl.cc b/libstdc++-v3/src/compatibility-ldbl.cc
index b3db73592e47..9658751bcbcf 100644
--- a/libstdc++-v3/src/compatibility-ldbl.cc
+++ b/libstdc++-v3/src/compatibility-ldbl.cc
@@ -24,6 +24,7 @@
 // <http://www.gnu.org/licenses/>.
 
 #include <locale>
+#include <cmath>
 #include <tr1/functional>
 
 #ifdef _GLIBCXX_LONG_DOUBLE_COMPAT