diff --git a/adminer/drivers/mysql.inc.php b/adminer/drivers/mysql.inc.php
index f2a4fed0..e532d500 100644
--- a/adminer/drivers/mysql.inc.php
+++ b/adminer/drivers/mysql.inc.php
@@ -1115,7 +1115,7 @@ if (!defined("DRIVER")) {
 			$return = "UNHEX($return)";
 		}
 		if ($field["type"] == "bit") {
-			$return = "CONV($return, 2, 10) + 0";
+			$return = "CONVERT(b$return, UNSIGNED)";
 		}
 		if (preg_match("~geometry|point|linestring|polygon~", $field["type"])) {
 			$prefix = (min_version(8) ? "ST_" : "");
diff --git a/changes.txt b/changes.txt
index ebbf6140..7b2947e7 100644
--- a/changes.txt
+++ b/changes.txt
@@ -1,4 +1,5 @@
 Adminer 4.16.0-dev:
+MySQL: Fix saving bit(64) values (bug #839)
 PostgreSQL: Preserve whitespace in EXPLAIN (bug #827)
 MS SQL: Foreign keys in non-default schema (bug #833)
 Oracle: Include tables granted by other user