diff --git a/phpcs.xml.dist b/phpcs.xml.dist
index 4a37fd55de..6e14ca6937 100644
--- a/phpcs.xml.dist
+++ b/phpcs.xml.dist
@@ -255,4 +255,19 @@
 		<exclude-pattern>/tests/phpunit/tests/*</exclude-pattern>
 	</rule>
 
+	<!-- Exclude some old classes that can't be renamed, as it would break back compat -->
+	<rule ref="PEAR.NamingConventions.ValidClassName.Invalid">
+		<exclude-pattern>/src/wp-admin/includes/class-wp-filesystem-ftpsockets\.php</exclude-pattern>
+		<exclude-pattern>/src/wp-includes/class-oembed\.php</exclude-pattern>
+		<exclude-pattern>/src/wp-includes/class-wp-oembed-controller\.php</exclude-pattern>
+		<exclude-pattern>/src/wp-includes/class-wp-xmlrpc-server\.php</exclude-pattern>
+		<exclude-pattern>/src/wp-includes/class-wp-text-diff-renderer-inline\.php</exclude-pattern>
+	</rule>
+	<rule ref="PEAR.NamingConventions.ValidClassName.StartWithCapital">
+		<exclude-pattern>/src/wp-admin/includes/class-wp-list-table-compat\.php</exclude-pattern>
+		<exclude-pattern>/src/wp-includes/class-wp-editor\.php</exclude-pattern>
+		<exclude-pattern>/src/wp-includes/class-wp-xmlrpc-server\.php</exclude-pattern>
+		<exclude-pattern>/src/wp-includes/wp-db\.php</exclude-pattern>
+		<exclude-pattern>/src/wp-includes/class-wp-dependency\.php</exclude-pattern>
+	</rule>
 </ruleset>