diff --git a/src/wp-admin/load-styles.php b/src/wp-admin/load-styles.php
index 75e655c4d4..64ae474199 100644
--- a/src/wp-admin/load-styles.php
+++ b/src/wp-admin/load-styles.php
@@ -134,7 +134,7 @@ foreach( $load as $handle ) {
 	}
 }
 
-header('Content-Type: text/css');
+header('Content-Type: text/css; charset=UTF-8');
 header('Expires: ' . gmdate( "D, d M Y H:i:s", time() + $expires_offset ) . ' GMT');
 header("Cache-Control: public, max-age=$expires_offset");