diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e26b013..3ac1fb53 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -37,6 +37,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com), and this
 
 * [#729](https://github.com/shlinkio/shlink/issues/729) Fixed weird error when fetching multiple visits result sets concurrently using mariadb or mysql.
 * [#735](https://github.com/shlinkio/shlink/issues/735) Fixed error when cleaning metadata cache during installation when APCu is enabled.
+* [#677](https://github.com/shlinkio/shlink/issues/677) Fixed `/health` endpoint returning `503` fail responses when the database connection has expired.
 
 
 ## 2.1.3 - 2020-04-09
diff --git a/module/Rest/config/dependencies.config.php b/module/Rest/config/dependencies.config.php
index 2434c88b..f6af6f85 100644
--- a/module/Rest/config/dependencies.config.php
+++ b/module/Rest/config/dependencies.config.php
@@ -4,7 +4,6 @@ declare(strict_types=1);
 
 namespace Shlinkio\Shlink\Rest;
 
-use Doctrine\DBAL\Connection;
 use Laminas\ServiceManager\AbstractFactory\ConfigAbstractFactory;
 use Laminas\ServiceManager\Factory\InvokableFactory;
 use Mezzio\Router\Middleware\ImplicitOptionsMiddleware;
@@ -47,7 +46,7 @@ return [
     ConfigAbstractFactory::class => [
         ApiKeyService::class => ['em'],
 
-        Action\HealthAction::class => [Connection::class, AppOptions::class, 'Logger_Shlink'],
+        Action\HealthAction::class => ['em', AppOptions::class, 'Logger_Shlink'],
         Action\MercureInfoAction::class => [LcobucciJwtProvider::class, 'config.mercure', 'Logger_Shlink'],
         Action\ShortUrl\CreateShortUrlAction::class => [
             Service\UrlShortener::class,
diff --git a/module/Rest/src/Action/HealthAction.php b/module/Rest/src/Action/HealthAction.php
index 4f3b9c64..ef1b6b88 100644
--- a/module/Rest/src/Action/HealthAction.php
+++ b/module/Rest/src/Action/HealthAction.php
@@ -4,7 +4,7 @@ declare(strict_types=1);
 
 namespace Shlinkio\Shlink\Rest\Action;
 
-use Doctrine\DBAL\Connection;
+use Doctrine\ORM\EntityManagerInterface;
 use Laminas\Diactoros\Response\JsonResponse;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
@@ -21,13 +21,13 @@ class HealthAction extends AbstractRestAction
     protected const ROUTE_PATH = '/health';
     protected const ROUTE_ALLOWED_METHODS = [self::METHOD_GET];
 
+    private EntityManagerInterface $em;
     private AppOptions $options;
-    private Connection $conn;
 
-    public function __construct(Connection $conn, AppOptions $options, ?LoggerInterface $logger = null)
+    public function __construct(EntityManagerInterface $em, AppOptions $options, ?LoggerInterface $logger = null)
     {
         parent::__construct($logger);
-        $this->conn = $conn;
+        $this->em = $em;
         $this->options = $options;
     }
 
@@ -39,7 +39,7 @@ class HealthAction extends AbstractRestAction
     public function handle(ServerRequestInterface $request): ResponseInterface
     {
         try {
-            $connected = $this->conn->ping();
+            $connected = $this->em->getConnection()->ping();
         } catch (Throwable $e) {
             $connected = false;
         }
diff --git a/module/Rest/test/Action/HealthActionTest.php b/module/Rest/test/Action/HealthActionTest.php
index 813fa5cc..2ec68d25 100644
--- a/module/Rest/test/Action/HealthActionTest.php
+++ b/module/Rest/test/Action/HealthActionTest.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace ShlinkioTest\Shlink\Rest\Action;
 
 use Doctrine\DBAL\Connection;
+use Doctrine\ORM\EntityManagerInterface;
 use Exception;
 use Laminas\Diactoros\Response\JsonResponse;
 use Laminas\Diactoros\ServerRequest;
@@ -21,7 +22,10 @@ class HealthActionTest extends TestCase
     public function setUp(): void
     {
         $this->conn = $this->prophesize(Connection::class);
-        $this->action = new HealthAction($this->conn->reveal(), new AppOptions(['version' => '1.2.3']));
+        $em = $this->prophesize(EntityManagerInterface::class);
+        $em->getConnection()->willReturn($this->conn->reveal());
+
+        $this->action = new HealthAction($em->reveal(), new AppOptions(['version' => '1.2.3']));
     }
 
     /** @test */