diff --git a/includes/Skins/SkinMinerva.php b/includes/Skins/SkinMinerva.php
index a10cd9e92..8cd9fd369 100644
--- a/includes/Skins/SkinMinerva.php
+++ b/includes/Skins/SkinMinerva.php
@@ -1077,16 +1077,6 @@ class SkinMinerva extends SkinMustache {
 		$requestAction = $this->getActionName();
 		$viewAction = $requestAction === 'view';
 
-		// Warning box styles are needed when reviewing old revisions
-		// and inside the fallback editor styles to action=edit page.
-		if (
-			$title->getNamespace() !== NS_MAIN ||
-			$request->getCheck( 'oldid' ) ||
-			!$viewAction
-		) {
-			$styles[] = 'skins.minerva.messageBox.styles';
-		}
-
 		if ( $title->isMainPage() ) {
 			$styles[] = 'skins.minerva.mainPage.styles';
 		} elseif ( $this->skinUserPageHelper->isUserPage() ) {
diff --git a/skin.json b/skin.json
index 2cf6cc423..a4f4754fa 100644
--- a/skin.json
+++ b/skin.json
@@ -539,7 +539,6 @@
 				"skins.minerva.icons",
 				"skins.minerva.styles",
 				"mediawiki.cookie",
-				"skins.minerva.messageBox.styles",
 				"mediawiki.util",
 				"mediawiki.router",
 				"mediawiki.Title",
@@ -610,13 +609,6 @@
 				"watchstar.js"
 			]
 		},
-		"skins.minerva.messageBox.styles": {
-			"class": "MediaWiki\\ResourceLoader\\CodexModule",
-			"codexStyleOnly": true,
-			"codexComponents": [
-				"CdxMessage"
-			]
-		},
 		"skins.minerva.categories.styles": {
 			"class": "MediaWiki\\ResourceLoader\\SkinModule",
 			"features": [
@@ -627,8 +619,7 @@
 			"class": "MediaWiki\\ResourceLoader\\CodexModule",
 			"codexStyleOnly": true,
 			"codexComponents": [
-				"CdxButton",
-				"CdxMessage"
+				"CdxButton"
 			]
 		}
 	},
@@ -637,7 +628,6 @@
 		"remoteSkinPath": "MinervaNeue/tests/qunit/skins.minerva.scripts",
 		"dependencies": [
 			"mediawiki.cookie",
-			"skins.minerva.messageBox.styles",
 			"skins.minerva.scripts",
 			"mobile.startup",
 			"mediawiki.user",