diff --git a/Makefile b/Makefile
index d9e7dd6..d94c960 100644
--- a/Makefile
+++ b/Makefile
@@ -16,6 +16,7 @@ $(DEST_DIR)/issue-%.pdf: issues/%
 		--to latex \
 		--pdf-engine xelatex \
 		--table-of-contents \
+		--lua-filter increase-header-levels.lua \
 		--variable title:"tildeverse zine $@" \
 		--standalone \
 		--output $@ \