diff --git a/phpBB/docs/CHANGELOG.html b/phpBB/docs/CHANGELOG.html
index 4d52e30a61..d4f6a1149c 100644
--- a/phpBB/docs/CHANGELOG.html
+++ b/phpBB/docs/CHANGELOG.html
@@ -186,6 +186,7 @@ p a {
 
 	<ul class="menu">
 		<li>[Fix] Re-allow searching within the memberlist</li>
+		<li>[Fix] Force prune related values to integers during conversions</li>
 	</ul>
 
 	</div>
diff --git a/phpBB/install/convertors/functions_phpbb20.php b/phpBB/install/convertors/functions_phpbb20.php
index eca72b64bd..9b5e236b6d 100644
--- a/phpBB/install/convertors/functions_phpbb20.php
+++ b/phpBB/install/convertors/functions_phpbb20.php
@@ -216,10 +216,10 @@ function phpbb_insert_forums()
 			'forum_type'		=> FORUM_POST,
 			'forum_status'		=> is_item_locked($row['forum_status']),
 			'enable_prune'		=> ($prune_enabled) ? $row['prune_enable'] : 0,
-			'prune_next'		=> null_to_zero($row['prune_next']),
-			'prune_days'		=> null_to_zero($row['prune_days']),
+			'prune_next'		=> (int) null_to_zero($row['prune_next']),
+			'prune_days'		=> (int) null_to_zero($row['prune_days']),
 			'prune_viewed'		=> 0,
-			'prune_freq'		=> null_to_zero($row['prune_freq']),
+			'prune_freq'		=> (int) null_to_zero($row['prune_freq']),
 
 			'forum_flags'		=> phpbb_forum_flags(),