diff --git a/contrib/debian/control b/contrib/debian/control
--- a/contrib/debian/control
+++ b/contrib/debian/control
@@ -5,6 +5,7 @@ Maintainer: Mercurial Developers <mercur
 Build-Depends:
  debhelper (>= 9),
  dh-python,
+ less,
  netbase,
  python-all,
  python-all-dev,