diff --git a/api/components/OAuth2/Entities/AccessTokenEntity.php b/api/components/OAuth2/Entities/AccessTokenEntity.php
index f9441fe..7b077ef 100644
--- a/api/components/OAuth2/Entities/AccessTokenEntity.php
+++ b/api/components/OAuth2/Entities/AccessTokenEntity.php
@@ -3,9 +3,12 @@ declare(strict_types=1);
 
 namespace api\components\OAuth2\Entities;
 
+use api\components\OAuth2\Repositories\PublicScopeRepository;
 use api\components\Tokens\TokensFactory;
+use DateTimeImmutable;
 use League\OAuth2\Server\CryptKeyInterface;
 use League\OAuth2\Server\Entities\AccessTokenEntityInterface;
+use League\OAuth2\Server\Entities\ScopeEntityInterface;
 use League\OAuth2\Server\Entities\Traits\EntityTrait;
 use League\OAuth2\Server\Entities\Traits\TokenEntityTrait;
 
@@ -15,16 +18,31 @@ class AccessTokenEntity implements AccessTokenEntityInterface {
         getExpiryDateTime as parentGetExpiryDateTime;
     }
 
+    /**
+     * There is no need to store offline_access scope in the resulting access_token.
+     * We cannot remove it from the token because otherwise we won't be able to form a refresh_token.
+     * That's why we delete offline_access before creating the token and then return it back.
+     *
+     * @return string
+     */
     public function __toString(): string {
-        // TODO: strip "offline_access" scope from the scopes list
-        return (string)TokensFactory::createForOAuthClient($this);
+        $scopes = $this->scopes;
+        $this->scopes = array_filter($this->scopes, function(ScopeEntityInterface $scope): bool {
+            return $scope->getIdentifier() !== PublicScopeRepository::OFFLINE_ACCESS;
+        });
+
+        $token = TokensFactory::createForOAuthClient($this);
+
+        $this->scopes = $scopes;
+
+        return (string)$token;
     }
 
     public function setPrivateKey(CryptKeyInterface $privateKey): void {
         // We use a general-purpose component to build JWT tokens, so there is no need to keep the key
     }
 
-    public function getExpiryDateTime() {
+    public function getExpiryDateTime(): DateTimeImmutable {
         // TODO: extend token life depending on scopes list
         return $this->parentGetExpiryDateTime();
     }
diff --git a/api/tests/unit/components/OAuth2/Entities/AccessTokenEntityTest.php b/api/tests/unit/components/OAuth2/Entities/AccessTokenEntityTest.php
new file mode 100644
index 0000000..959c52e
--- /dev/null
+++ b/api/tests/unit/components/OAuth2/Entities/AccessTokenEntityTest.php
@@ -0,0 +1,44 @@
+<?php
+declare(strict_types=1);
+
+namespace api\tests\unit\components\OAuth2\Entities;
+
+use api\components\OAuth2\Entities\AccessTokenEntity;
+use api\tests\unit\TestCase;
+use League\OAuth2\Server\Entities\ClientEntityInterface;
+use League\OAuth2\Server\Entities\ScopeEntityInterface;
+
+class AccessTokenEntityTest extends TestCase {
+
+    public function testToString() {
+        /** @var ClientEntityInterface|\PHPUnit\Framework\MockObject\MockObject $client */
+        $client = $this->createMock(ClientEntityInterface::class);
+        $client->method('getIdentifier')->willReturn('mockClientId');
+
+        $entity = new AccessTokenEntity();
+        $entity->setClient($client);
+        $entity->setExpiryDateTime(new \DateTimeImmutable());
+        $entity->addScope($this->createScopeEntity('first'));
+        $entity->addScope($this->createScopeEntity('second'));
+        $entity->addScope($this->createScopeEntity('offline_access'));
+
+        $token = (string)$entity;
+        $payloads = json_decode(base64_decode(explode('.', $token)[1]), true);
+        $this->assertStringNotContainsString('offline_access', $payloads['ely-scopes']);
+
+        $scopes = $entity->getScopes();
+        $this->assertCount(3, $scopes);
+        $this->assertSame('first', $scopes[0]->getIdentifier());
+        $this->assertSame('second', $scopes[1]->getIdentifier());
+        $this->assertSame('offline_access', $scopes[2]->getIdentifier());
+    }
+
+    private function createScopeEntity(string $id): ScopeEntityInterface {
+        /** @var ScopeEntityInterface|\PHPUnit\Framework\MockObject\MockObject $entity */
+        $entity = $this->createMock(ScopeEntityInterface::class);
+        $entity->method('getIdentifier')->willReturn($id);
+
+        return $entity;
+    }
+
+}