diff --git a/Cantera/src/base/ctml.cpp b/Cantera/src/base/ctml.cpp
index df90bb12a..3bed038ac 100755
--- a/Cantera/src/base/ctml.cpp
+++ b/Cantera/src/base/ctml.cpp
@@ -29,6 +29,7 @@
 
 #include <cctype>
 #include <cstring>
+#include <cstdlib>
 
 
 using namespace std;
diff --git a/Cantera/src/base/xml.cpp b/Cantera/src/base/xml.cpp
index ef096de5d..5bea82193 100755
--- a/Cantera/src/base/xml.cpp
+++ b/Cantera/src/base/xml.cpp
@@ -32,6 +32,7 @@ using namespace std;
 #include "global.h"
 #include "stringUtils.h"
 #include <ctype.h>
+#include <cstdlib>
 
 namespace Cantera {