diff --git a/src/wp-admin/themes.php b/src/wp-admin/themes.php
index 30fc9cd4f4..cee26b626c 100644
--- a/src/wp-admin/themes.php
+++ b/src/wp-admin/themes.php
@@ -9,23 +9,50 @@
 /** WordPress Administration Bootstrap */
 require_once( dirname( __FILE__ ) . '/admin.php' );
 
-if ( !current_user_can('switch_themes') && !current_user_can('edit_theme_options') )
-	wp_die( __( 'Cheatin’ uh?' ), 403 );
+if ( ! current_user_can( 'switch_themes' ) && ! current_user_can( 'edit_theme_options' ) ) {
+	wp_die(
+		'<h1>' . __( 'Cheatin&#8217; uh?' ) . '</h1>' .
+		'<p>' . __( 'You are not allowed to edit theme options on this site.' ) . '</p>',
+		403
+	);
+}
 
 if ( current_user_can( 'switch_themes' ) && isset($_GET['action'] ) ) {
 	if ( 'activate' == $_GET['action'] ) {
 		check_admin_referer('switch-theme_' . $_GET['stylesheet']);
 		$theme = wp_get_theme( $_GET['stylesheet'] );
-		if ( ! $theme->exists() || ! $theme->is_allowed() )
-			wp_die( __( 'Cheatin&#8217; uh?' ), 403 );
+
+		if ( ! $theme->exists() || ! $theme->is_allowed() ) {
+			wp_die(
+				'<h1>' . __( 'Cheatin&#8217; uh?' ) . '</h1>' .
+				'<p>' . __( 'The requested theme does not exist.' ) . '</p>',
+				403
+			);
+		}
+
 		switch_theme( $theme->get_stylesheet() );
 		wp_redirect( admin_url('themes.php?activated=true') );
 		exit;
 	} elseif ( 'delete' == $_GET['action'] ) {
 		check_admin_referer('delete-theme_' . $_GET['stylesheet']);
 		$theme = wp_get_theme( $_GET['stylesheet'] );
-		if ( !current_user_can('delete_themes') || ! $theme->exists() )
-			wp_die( __( 'Cheatin&#8217; uh?' ), 403 );
+
+		if ( ! current_user_can( 'delete_themes' ) ) {
+			wp_die(
+				'<h1>' . __( 'Cheatin&#8217; uh?' ) . '</h1>' .
+				'<p>' . __( 'You are not allowed to delete this item.' ) . '</p>',
+				403
+			);
+		}
+
+		if ( ! $theme->exists() ) {
+			wp_die(
+				'<h1>' . __( 'Cheatin&#8217; uh?' ) . '</h1>' .
+				'<p>' . __( 'The requested theme does not exist.' ) . '</p>',
+				403
+			);
+		}
+
 		$active = wp_get_theme();
 		if ( $active->get( 'Template' ) == $_GET['stylesheet'] ) {
 			wp_redirect( admin_url( 'themes.php?delete-active-child=true' ) );