diff --git a/Testing/Utilities/ossimElevManagerTest.cxx b/Testing/Utilities/ossimElevManagerTest.cxx
index b8c4ed1fda479e9623d897e06a735d010e32a7de..548a220b4fec8424c8506805c306c13bad26bc08 100644
--- a/Testing/Utilities/ossimElevManagerTest.cxx
+++ b/Testing/Utilities/ossimElevManagerTest.cxx
@@ -12,6 +12,7 @@
 
 #include <iostream>
 #include <fstream>
+#include <cstdlib>
 
 #include "elevation/ossimElevManager.h"