diff --git a/Tools/Makefile.am b/Tools/Makefile.am
index a98b77857..3526fead7 100644
--- a/Tools/Makefile.am
+++ b/Tools/Makefile.am
@@ -5,6 +5,7 @@ SUBDIRS = \
 	AssemTris \
 	Clipper \
 	DEM \
+	Polygon \
 	Dem2node \
 	DemInfo \
 	DemRaw2ascii \