diff --git a/mdl_rules.rb b/mdl_rules.rb
index e84a69429..4dfe58e1c 100644
--- a/mdl_rules.rb
+++ b/mdl_rules.rb
@@ -1,7 +1,6 @@
 all
 exclude_rule 'MD003'
 exclude_rule 'MD004'
-exclude_rule 'MD009'
 exclude_rule 'MD010'
 exclude_rule 'MD011'
 exclude_rule 'MD012'