diff --git src/wp-includes/functions.php src/wp-includes/functions.php
index f5d7d8158c..58720cc351 100644
--- src/wp-includes/functions.php
+++ src/wp-includes/functions.php
@@ -229,8 +229,9 @@ function number_format_i18n( $number, $decimals = 0 ) {
 	 * @since  2.8.0
 	 *
 	 * @param string $formatted Converted number in string format.
+	 * @param int $decimals Precision of the number of decimal places
 	 */
-	return apply_filters( 'number_format_i18n', $formatted );
+	return apply_filters( 'number_format_i18n', $formatted, $decimals );
 }
 
 /**