diff --git a/simplenews.install b/simplenews.install
index 00517cc..4b7dec3 100644
--- a/simplenews.install
+++ b/simplenews.install
@@ -831,3 +831,18 @@ function simplenews_update_7007() {
     'description' => 'Sender name for newsletter emails.',
   ));
 }
+
+/**
+ * Add the timestamp column to the {simplenews_subscription} table if missing.
+ */
+function simplenews_update_7008() {
+  if (!db_field_exists('simplenews_subscription', 'timestamp')) {
+    db_add_field('simplenews_subscription', 'timestamp', array(
+      'description' => 'UNIX timestamp of when the user is (un)subscribed.',
+      'type' => 'int',
+      'unsigned' => TRUE,
+      'not null' => TRUE,
+      'default' => 0,
+    ));
+  }
+}
\ No newline at end of file
diff --git a/tests/simplenews.test b/tests/simplenews.test
index 1211629..b4c85ac 100644
--- a/tests/simplenews.test
+++ b/tests/simplenews.test
@@ -1870,6 +1870,11 @@ class SimpleNewsUpgradePathTestCase extends UpgradePathTestCase {
     );
     $this->drupalPost('admin/modules', $edit, t('Save configuration'));
 
+    // Attempt to subscribe a mail address.
+    $mail = 'new@example.org';
+    $tid = 1;
+    module_load_include('module', 'simplenews');
+    simplenews_subscribe_user($mail, $tid, FALSE);
 
     $this->drupalGet('admin/config/services/simplenews');
     $this->assertText('Drupal 6 newsletter');
@@ -1877,6 +1882,7 @@ class SimpleNewsUpgradePathTestCase extends UpgradePathTestCase {
 
     $this->drupalGet('admin/people/simplenews');
     $this->assertText('another@example.org');
+    $this->assertText($mail);
 
     $this->drupalGet('admin/structure/taxonomy/newsletter');