diff --git a/adminer/drivers/mongo.inc.php b/adminer/drivers/mongo.inc.php
index 7b83a285..88c8e0db 100644
--- a/adminer/drivers/mongo.inc.php
+++ b/adminer/drivers/mongo.inc.php
@@ -618,6 +618,9 @@ if (isset($_GET["mongo"])) {
 		if ($db != "") {
 			$options["db"] = $db;
 		}
+		if (($auth_source = getenv("MONGO_AUTH_SOURCE"))) {
+			$options["authSource"] = $auth_source;
+		}
 		try {
 			$connection->_link = $connection->connect("mongodb://$server", $options);
 			if ($password != "") {
diff --git a/changes.txt b/changes.txt
index 08f369b1..15d4fa42 100644
--- a/changes.txt
+++ b/changes.txt
@@ -8,6 +8,7 @@ SQLite: Handle error in altering table (bug #697)
 SQLite: Allow setting auto increment for empty tables
 SQLite: Preserve auto increment when recreating table
 MS SQL: Support foreign keys to other DB
+MongoDB: Allow setting authSource from environment variable 
 
 Adminer 4.7.2 (released 2019-07-18):
 Do not attempt logging in without password (bug #676)