diff --git a/src/Plugin/Block/MasqueradeBlock.php b/src/Plugin/Block/MasqueradeBlock.php
index 0cd710d..22fa6c7 100644
--- a/src/Plugin/Block/MasqueradeBlock.php
+++ b/src/Plugin/Block/MasqueradeBlock.php
@@ -80,7 +80,8 @@ class MasqueradeBlock extends BlockBase implements ContainerFactoryPluginInterfa
       return AccessResult::forbidden();
     }
     if ($this->masquerade->isMasquerading()) {
-      return AccessResult::forbidden();
+      return AccessResult::forbidden()
+        ->addCacheContexts(['session.is_masquerading']);
     }
     // Display block for all users that has any of masquerade permissions.
     return AccessResult::allowedIfHasPermissions($account, $this->masquerade->getPermissions(), 'OR')