diff --git a/modules/user/src/PrivateTempStore.php b/modules/user/src/PrivateTempStore.php
index 651227c..fdc91af 100644
--- a/modules/user/src/PrivateTempStore.php
+++ b/modules/user/src/PrivateTempStore.php
@@ -125,6 +125,13 @@ class PrivateTempStore {
       }
     }
 
+    // Ensure that an anonymous user has a session created for them, as
+    // otherwise subsequent page loads will not be able to retrieve their
+    // tempstore data.
+    if ($this->currentUser->isAnonymous()) {
+      $_SESSION['forced'] = TRUE;
+    }
+
     $value = (object) [
       'owner' => $this->getOwner(),
       'data' => $value,