diff --git a/src/main/resources/templates/merge-pdfs.html b/src/main/resources/templates/merge-pdfs.html
index f6ace6d7..1670a446 100644
--- a/src/main/resources/templates/merge-pdfs.html
+++ b/src/main/resources/templates/merge-pdfs.html
@@ -5,6 +5,7 @@
 <head>
   <th:block th:insert="~{fragments/common :: head(title=#{merge.title}, header=#{merge.header})}"></th:block>
   <link rel="stylesheet" th:href="@{'/css/merge.css'}">
+  <script th:src="@{'/js/thirdParty/pdf-lib.min.js'}"></script>
 </head>
 
 <body>
