diff --git a/ext/tag_list/main.php b/ext/tag_list/main.php
index 47699966..36685550 100644
--- a/ext/tag_list/main.php
+++ b/ext/tag_list/main.php
@@ -136,7 +136,7 @@ class TagList implements Extension {
 		$tag_data = $result->GetArray();
 
 		$html = "";
-		$lastLetter = 0;
+		$lastLetter = "";
 		foreach($tag_data as $row) {
 			$h_tag = html_escape($row['tag']);
 			$count = $row['count'];