diff --git a/otk/ustring.i b/otk/ustring.i
index 45057334..d693e7dc 100644
--- a/otk/ustring.i
+++ b/otk/ustring.i
@@ -1,7 +1,7 @@
 // SWIG typemaps for otk::ustring
 
 %{
-#include "ustring.hh"
+#include "otk/ustring.hh"
 %}
 
 namespace otk {