diff --git a/samples/help/Makefile.in b/samples/help/Makefile.in
index 2828c680d8..ab6a3d4232 100644
--- a/samples/help/Makefile.in
+++ b/samples/help/Makefile.in
@@ -17,6 +17,7 @@ PROGRAM=help
 
 OBJECTS=demo.o
 
+DATADIRS=doc
 DATAFILES=doc.cnt doc.hlp doc.hpj doc.tex doc.zip back.gif forward.gif books.gif contents.gif
 
 include ../../src/makeprog.env