diff --git a/src/wp-admin/admin-header.php b/src/wp-admin/admin-header.php
index cd068f1f9b..d2b5fda09e 100644
--- a/src/wp-admin/admin-header.php
+++ b/src/wp-admin/admin-header.php
@@ -192,10 +192,6 @@ $admin_body_class .= ' no-customize-support no-svg';
 if ( $current_screen->is_block_editor() ) {
 	// Default to is-fullscreen-mode to avoid jumps in the UI.
 	$admin_body_class .= ' block-editor-page is-fullscreen-mode wp-embed-responsive';
-
-	if ( current_theme_supports( 'editor-styles' ) && current_theme_supports( 'dark-editor-style' ) ) {
-		$admin_body_class .= ' is-dark-theme';
-	}
 }
 
 $error_get_last = error_get_last();