diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index fd8d1968ec5..75e017c7151 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7265,8 +7265,12 @@ let
   };
 
   mercurial = import ../applications/version-management/mercurial {
-    inherit fetchurl stdenv python makeWrapper getConfig tk;
+    inherit fetchurl stdenv makeWrapper getConfig tk;
     guiSupport = getConfig ["mercurial" "guiSupport"] false; # for hgk (gitk gui for hg)
+    python = # allow cloning sources from https servers.
+      if getConfig ["mercurial" "httpsSupport"] true
+      then pythonFull
+      else pythonBase;
   };
 
   meshlab = import ../applications/graphics/meshlab {