diff --git a/include/osgSim/ShapeAttribute b/include/osgSim/ShapeAttribute
index 48bafcb55..d5b113aac 100644
--- a/include/osgSim/ShapeAttribute
+++ b/include/osgSim/ShapeAttribute
@@ -16,6 +16,7 @@
 
 
 #include <string>
+#include <string.h>
 #include <vector>
 
 #include <osg/Object>