diff --git a/wp-admin/customize.php b/wp-admin/customize.php
index dcc3f96002..a081573b22 100644
--- a/wp-admin/customize.php
+++ b/wp-admin/customize.php
@@ -9,13 +9,10 @@
 
 require_once( './admin.php' );
 if ( ! current_user_can( 'edit_theme_options' ) )
-	die( 'Cap check failed' );
+	wp_die( __( 'Cheatin’ uh?' ) );
 
 global $wp_scripts, $wp_customize;
 
-if ( ! $wp_customize->is_preview() )
-	die( 'is_preview() failed' );
-
 wp_reset_vars( array( 'theme' ) );
 
 if ( ! $theme )