diff --git a/examples/osgshadow/IslandScene.cpp b/examples/osgshadow/IslandScene.cpp
index 326447380..7ef2710f3 100644
--- a/examples/osgshadow/IslandScene.cpp
+++ b/examples/osgshadow/IslandScene.cpp
@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include <osg/ArgumentParser>
 #include <osg/Group>
 #include <osg/Geode>