diff --git a/Prep/Makefile.am b/Prep/Makefile.am
index 51f8ae2bb..96c87b412 100644
--- a/Prep/Makefile.am
+++ b/Prep/Makefile.am
@@ -1,4 +1,5 @@
 SUBDIRS = \
+	DemChop \
 	DemInfo \
 	DemRaw2ascii \
 	GenAirports \