diff --git a/debian/copyright b/debian/copyright
index f5e2497..63e3a42 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -1,4 +1,4 @@
-Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: Cyrus SASL
 Source: ftp://ftp.cyrusimap.org/cyrus-sasl/
 Files-Excluded: dlcompat-20010505