diff --git a/phpBB/adm/style/admin.css b/phpBB/adm/style/admin.css
index 2ad964e6bb..2322b3da88 100644
--- a/phpBB/adm/style/admin.css
+++ b/phpBB/adm/style/admin.css
@@ -2692,9 +2692,11 @@ fieldset.permissions .padding {
 	word-break: break-all;
 }
 
+/* stylelint-disable declaration-property-unit-whitelist */
 .emoji {
 	min-height: 18px;
 	min-width: 18px;
 	height: 1em;
 	width: 1em;
 }
+/* stylelint-enable declaration-property-unit-whitelist */