diff --git a/src/core/callback.cc b/src/core/callback.cc
index 63eef5ca1..c2a188659 100644
--- a/src/core/callback.cc
+++ b/src/core/callback.cc
@@ -37,6 +37,7 @@ ATTRIBUTE_CHECKER_IMPLEMENT (Callback);
 
 #if (__GNUC__ >= 3)
 
+#include <stdlib.h>
 #include <cxxabi.h>
 #include "log.h"