diff --git a/.stylelintrc.json b/.stylelintrc.json
index ba1d8f30..b681cd2e 100644
--- a/.stylelintrc.json
+++ b/.stylelintrc.json
@@ -1,7 +1,6 @@
 {
 	"extends": "stylelint-config-wikimedia",
 	"rules": {
-		"selector-max-id": null,
-		"selector-pseudo-element-colon-notation": null
+		"selector-max-id": null
 	}
 }
diff --git a/modules/interwiki.css b/modules/interwiki.css
index a6ad336e..047baa44 100644
--- a/modules/interwiki.css
+++ b/modules/interwiki.css
@@ -40,7 +40,7 @@ input#mw-interwiki-url {
 	white-space: nowrap;
 }
 
-.mw-interwiki-legend th:before,
+.mw-interwiki-legend th::before,
 .mw-interwiki-legend .mw-collapsible-toggle {
 	font-weight: normal !important; /* stylelint-disable-line declaration-no-important */
 }