diff --git a/src/osgUtil/tristripper/include/public_types.h b/src/osgUtil/tristripper/include/public_types.h
index 66cca5cf1..1d795c082 100644
--- a/src/osgUtil/tristripper/include/public_types.h
+++ b/src/osgUtil/tristripper/include/public_types.h
@@ -11,6 +11,7 @@
 #define TRI_STRIPPER_HEADER_GUARD_PUBLIC_TYPES_H
 
 #include <vector>
+#include <cstdlib>
 
 
 
@@ -18,22 +19,22 @@
 namespace triangle_stripper
 {
 
-	typedef size_t index;
-	typedef std::vector<index> indices;
+    typedef size_t index;
+    typedef std::vector<index> indices;
 
-	enum primitive_type
-	{
-		TRIANGLES		= 0x0004,	// = GL_TRIANGLES
-		TRIANGLE_STRIP	= 0x0005	// = GL_TRIANGLE_STRIP
-	};
+    enum primitive_type
+    {
+        TRIANGLES        = 0x0004,    // = GL_TRIANGLES
+        TRIANGLE_STRIP    = 0x0005    // = GL_TRIANGLE_STRIP
+    };
 
-	struct primitive_group
-	{
-		indices			Indices;
-		primitive_type	Type;
-	};
+    struct primitive_group
+    {
+        indices            Indices;
+        primitive_type    Type;
+    };
 
-	typedef std::vector<primitive_group> primitive_vector;
+    typedef std::vector<primitive_group> primitive_vector;
 
 }