diff --git a/templates/shared-utils.tpl.html b/templates/shared-utils.tpl.html
index 958f17a..e7d5c85 100644
--- a/templates/shared-utils.tpl.html
+++ b/templates/shared-utils.tpl.html
@@ -1,6 +1,11 @@
-<!--% MACRO zero_pad_left(word) BLOCK %-->
+<!--% MACRO zero_pad_left(word, pad_length) BLOCK %-->
+	<!--% IF pad_length %-->
+		<!--% zero_pad_format = "%0${pad_length}s" %-->
+	<!--% ELSE %-->
+		<!--% zero_pad_format = "%04s" %-->
+	<!--% END %-->
 <!--% USE String(word) %-->
-<!--% String.format("%04s") %-->
+	<!--% String.format(zero_pad_format) %-->
 <!--% END %-->
 
 <!--% MACRO display_choice(choice, display_when_true, display_when_false) BLOCK %-->