diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index ea27ce79adc..1e2cceba37a 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,8 @@
+2014-12-03  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/64161
+	* src/c++11/condition_variable.cc: Include <cstdlib>.
+
 2014-12-02  Jonathan Wakely  <jwakely@redhat.com>
 
 	* config/abi/pre/gnu.ver: Add new exports.
diff --git a/libstdc++-v3/src/c++11/condition_variable.cc b/libstdc++-v3/src/c++11/condition_variable.cc
index c2768eb86e4..d3c7fcd3750 100644
--- a/libstdc++-v3/src/c++11/condition_variable.cc
+++ b/libstdc++-v3/src/c++11/condition_variable.cc
@@ -23,6 +23,7 @@
 // <http://www.gnu.org/licenses/>.
 
 #include <condition_variable>
+#include <cstdlib>
 
 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)