diff --git a/app/src/main/assets/gpl3.html b/app/src/main/assets/gpl3.html
index 790af2915..a0d7776a2 100644
--- a/app/src/main/assets/gpl3.html
+++ b/app/src/main/assets/gpl3.html
@@ -1,7 +1,6 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
-        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<!DOCTYPE html>
 
-<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<html lang="en">
     <body>
         <h3 style="text-align: center;">GNU GENERAL PUBLIC LICENSE</h3>
         <p style="text-align: center;">Version 3, 29 June 2007</p>
@@ -630,4 +629,4 @@
             Program, unless a warranty or assumption of liability accompanies a
             copy of the Program in return for a fee.</p>
 
-    </body></html>
\ No newline at end of file
+    </body></html>
