diff --git a/org_mode_samples/plain_lists/Makefile b/org_mode_samples/plain_lists/Makefile
index f4fe91c..ba131d4 100644
--- a/org_mode_samples/plain_lists/Makefile
+++ b/org_mode_samples/plain_lists/Makefile
@@ -18,5 +18,5 @@ all: paragraphs.tree.txt
 clean:
 > rm -rf *.tree.txt
 
-%.tree.txt: %.org
+%.tree.txt: %.org ../common.el ../dump_org_ast.bash
 > ../dump_org_ast.bash $< $@