diff --git a/framework/i18n/data/README.txt b/framework/i18n/data/README.txt
index 5049dfa6fa..cf1b8a4477 100644
--- a/framework/i18n/data/README.txt
+++ b/framework/i18n/data/README.txt
@@ -2,7 +2,7 @@
                 CLDR v23.1 (May 15, 2013)
 
 This directory contains the CLDR data files in form of PHP scripts.
-They are obtained by extracting the CLDR data (http://unicode.org/Public/cldr/23.1/)
+They are obtained by extracting the CLDR data (https://unicode.org/Public/cldr/23.1/)
 with the script "build/build cldr".
 
 Only the data relevant to date and number formatting are extracted.