diff --git a/lib/src/test/small_zimfile_data/main.html b/lib/src/test/small_zimfile_data/main.html
index 5785e31..0a6324a 100644
--- a/lib/src/test/small_zimfile_data/main.html
+++ b/lib/src/test/small_zimfile_data/main.html
@@ -1,8 +1,8 @@
 <html>
 <head>
-  <meta charset="UTF-8">
-  <title>Test ZIM file</title>
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta charset="UTF-8">
+    <title>Test ZIM file</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
 </head>
 
 <body>
