diff --git a/src/Prep/Makefile.am b/src/Prep/Makefile.am
index b651ca51..8d799cc3 100644
--- a/src/Prep/Makefile.am
+++ b/src/Prep/Makefile.am
@@ -1,5 +1,6 @@
+DISTDIRS = ArrayFit
+
 SUBDIRS = \
-	ArrayFit \
 	DemChop \
 	DemInfo \
 	DemRaw2ascii \