diff --git a/Mk/lint.mk b/Mk/lint.mk
index f327dc611f..fcb47c0b39 100644
--- a/Mk/lint.mk
+++ b/Mk/lint.mk
@@ -81,6 +81,9 @@ lint-model:
 		(xmllint $${MODEL} --xpath '//*[@type="CSVListField" and Mask and (not(MaskPerItem) or MaskPerItem=N)]' 2> /dev/null | grep '^<' || true) | while read LINE; do \
 			echo "$${MODEL}: $${LINE} uses Mask regex with MaskPerItem=N"; \
 		done; \
+		(xmllint $${MODEL} --xpath '//*[@type="CSVListField" and not(Mask)]' 2> /dev/null | grep '^<' || true) | while read LINE; do \
+			echo "$${MODEL}: $${LINE} does not specify a Mask regex"; \
+		done; \
 		for TYPE in .\\AliasesField .\\DomainIPField HostnameField IPPortField NetworkField MacAddressField .\\RangeAddressField; do \
 			(xmllint $${MODEL} --xpath '//*[@type="'$${TYPE}'" and FieldSeparator=","]' 2> /dev/null | grep '^<' || true) | while read LINE; do \
 				echo "$${MODEL}: $${LINE} FieldSeparator=, is the default"; \