diff --git a/comments-bundle/CHANGELOG.md b/comments-bundle/CHANGELOG.md
index 708fdade6c5..a310ce02a4e 100644
--- a/comments-bundle/CHANGELOG.md
+++ b/comments-bundle/CHANGELOG.md
@@ -2,5 +2,6 @@
 
 ## DEV
 
+ * Remove subscriptions that are not activated within 24 hours (see contao/core-bundle#1512).
  * Append the parent ID to the form field IDs to prevent duplicate IDs (see contao/core-bundle#1493).
  * Replace `<div class="quote">` with `<blockquote>` (see contao/core#2244).
diff --git a/comments-bundle/src/Resources/contao/classes/Comments.php b/comments-bundle/src/Resources/contao/classes/Comments.php
index e820b850cca..e0dd7650e42 100644
--- a/comments-bundle/src/Resources/contao/classes/Comments.php
+++ b/comments-bundle/src/Resources/contao/classes/Comments.php
@@ -506,6 +506,24 @@ public function convertLineFeeds($strComment)
 		return preg_replace(array_keys($arrReplace), array_values($arrReplace), $strComment);
 	}
 
+	/**
+	 * Purge subscriptions that have not been activated within 24 hours
+	 */
+	public function purgeSubscriptions()
+	{
+		$objNotify = \CommentsNotifyModel::findExpiredSubscriptions();
+
+		if ($objNotify === null)
+		{
+			return;
+		}
+
+		foreach ($objNotify as $objModel)
+		{
+			$objModel->delete();
+		}
+	}
+
 	/**
 	 * Add the subscription and send the activation mail (double opt-in)
 	 *
diff --git a/comments-bundle/src/Resources/contao/config/config.php b/comments-bundle/src/Resources/contao/config/config.php
index df693ba3574..fba7f658fcf 100644
--- a/comments-bundle/src/Resources/contao/config/config.php
+++ b/comments-bundle/src/Resources/contao/config/config.php
@@ -23,3 +23,6 @@
 		'stylesheet' => 'bundles/contaocomments/comments.min.css'
 	)
 ));
+
+// Cron jobs
+$GLOBALS['TL_CRON']['daily']['purgeCommentSubscriptions'] = array('Comments', 'purgeSubscriptions');
diff --git a/comments-bundle/src/Resources/contao/models/CommentsNotifyModel.php b/comments-bundle/src/Resources/contao/models/CommentsNotifyModel.php
index c168c07d90c..06c821086a5 100644
--- a/comments-bundle/src/Resources/contao/models/CommentsNotifyModel.php
+++ b/comments-bundle/src/Resources/contao/models/CommentsNotifyModel.php
@@ -124,6 +124,20 @@ public static function findActiveBySourceAndParent($strSource, $intParent, array
 
 		return static::findBy(array("$t.source=? AND $t.parent=? AND tokenConfirm=''"), array($strSource, $intParent), $arrOptions);
 	}
+
+	/**
+	 * Find subscriptions that have not been activated for more than 24 hours
+	 *
+	 * @param array $arrOptions An optional options array
+	 *
+	 * @return Model\Collection|CommentsNotifyModel[]|CommentsNotifyModel|null A collection of models or null if there are no active subscriptions
+	 */
+	public static function findExpiredSubscriptions(array $arrOptions=array())
+	{
+		$t = static::$strTable;
+
+		return static::findBy(array("$t.addedOn<? AND $t.tokenConfirm!=''"), array(strtotime('-1 day')), $arrOptions);
+	}
 }
 
 class_alias(CommentsNotifyModel::class, 'CommentsNotifyModel');