diff --git a/src/wp-includes/pluggable.php b/src/wp-includes/pluggable.php
index e3a33e735f..76cdb33d45 100644
--- a/src/wp-includes/pluggable.php
+++ b/src/wp-includes/pluggable.php
@@ -1935,7 +1935,7 @@ function wp_check_password($password, $hash, $user_id = '') {
 
 	// If the hash is still md5...
 	if ( strlen($hash) <= 32 ) {
-		$check = ( $hash == md5($password) );
+		$check = hash_equals( $hash, md5( $password ) );
 		if ( $check && $user_id ) {
 			// Rehash using new hash.
 			wp_set_password($password, $user_id);