diff --git a/rules/rules.mk b/rules/rules.mk
index 46f1a73d..e269a9b5 100644
--- a/rules/rules.mk
+++ b/rules/rules.mk
@@ -181,8 +181,8 @@ PANDOCARGS += --top-level-division=$(firstword $(DIVISIONS))
 PANDOCARGS += --reference-location=$(lastword $(DIVISIONS))
 PANDOCNORMALIZEARGS ?=
 PANDOCNORMALIZEARGS += --wrap=preserve
-PANDOCNORMALIZEARGS += --from markdown-space_in_atx_header+ascii_identifiers+four_space_rule
-PANDOCNORMALIZEARGS += --to markdown+smart-four_space_rule
+PANDOCNORMALIZEARGS += --from markdown-space_in_atx_header+ascii_identifiers+four_space_rule-auto_identifiers
+PANDOCNORMALIZEARGS += --to markdown+smart-four_space_rule+auto_identifiers
 PANDOCFILTERS ?=
 PANDOCFILTERARGS ?=