diff --git a/src/Plugin/OpenIDConnectClient/Tunnistamo.php b/src/Plugin/OpenIDConnectClient/Tunnistamo.php
index 97e2028..529ddcb 100644
--- a/src/Plugin/OpenIDConnectClient/Tunnistamo.php
+++ b/src/Plugin/OpenIDConnectClient/Tunnistamo.php
@@ -297,7 +297,7 @@ public function getClientScopes(): array {
     $scopes = $this->configuration['client_scopes'] ?? [];
 
     if (!$scopes) {
-      return [];
+      return parent::getClientScopes();
     }
     return explode(',', $this->configuration['client_scopes']);
   }
diff --git a/tests/src/Kernel/TunnistamoClientTest.php b/tests/src/Kernel/TunnistamoClientTest.php
index 6398d56..65bbca3 100644
--- a/tests/src/Kernel/TunnistamoClientTest.php
+++ b/tests/src/Kernel/TunnistamoClientTest.php
@@ -22,7 +22,7 @@ public function testGetClientScopes() : void {
     $config = $plugin->getConfiguration();
     $this->assertSame($config['client_scopes'], $plugin->defaultConfiguration()['client_scopes']);
     $this->setPluginConfiguration('client_scopes', '');
-    $this->assertSame([], $this->getPlugin()->getClientScopes());
+    $this->assertSame(['openid', 'email'], $this->getPlugin()->getClientScopes());
   }
 
   /**