diff --git a/src/wp-includes/formatting.php b/src/wp-includes/formatting.php
index 9daee4ca71..9dba689b32 100644
--- a/src/wp-includes/formatting.php
+++ b/src/wp-includes/formatting.php
@@ -1985,7 +1985,7 @@ function remove_accents( $string ) {
  */
 function sanitize_file_name( $filename ) {
 	$filename_raw  = $filename;
-	$special_chars = array( '?', '[', ']', '/', '\\', '=', '<', '>', ':', ';', ',', "'", '"', '&', '$', '#', '*', '(', ')', '|', '~', '`', '!', '{', '}', '%', '+', chr( 0 ) );
+	$special_chars = array( '?', '[', ']', '/', '\\', '=', '<', '>', ':', ';', ',', "'", '"', '&', '$', '#', '*', '(', ')', '|', '~', '`', '!', '{', '}', '%', '+', '’', '«', '»', '”', '“', chr( 0 ) );
 
 	// Check for support for utf8 in the installed PCRE library once and store the result in a static.
 	static $utf8_pcre = null;
diff --git a/tests/phpunit/tests/formatting/SanitizeFileName.php b/tests/phpunit/tests/formatting/SanitizeFileName.php
index b715960e76..76c0d9705c 100644
--- a/tests/phpunit/tests/formatting/SanitizeFileName.php
+++ b/tests/phpunit/tests/formatting/SanitizeFileName.php
@@ -11,7 +11,7 @@ class Tests_Formatting_SanitizeFileName extends WP_UnitTestCase {
 	}
 
 	function test_removes_special_chars() {
-		$special_chars = array( '?', '[', ']', '/', '\\', '=', '<', '>', ':', ';', ',', "'", '"', '&', '$', '#', '*', '(', ')', '|', '~', '`', '!', '{', '}', '%', '+', chr( 0 ) );
+		$special_chars = array( '?', '[', ']', '/', '\\', '=', '<', '>', ':', ';', ',', "'", '"', '&', '$', '#', '*', '(', ')', '|', '~', '`', '!', '{', '}', '%', '+', '’', '«', '»', '”', '“', chr( 0 ) );
 		$string        = 'test';
 		foreach ( $special_chars as $char ) {
 			$string .= $char;