diff --git a/Make/makedirdefs b/Make/makedirdefs
index 443240ff4..a3c909aef 100644
--- a/Make/makedirdefs
+++ b/Make/makedirdefs
@@ -48,6 +48,7 @@ WRAPPER_DIRS = \
 	osgSim \
 	osgText \
 	osgUtil \
+	osgTerrain \
 	osgViewer \