diff --git a/gnu/packages/version-control.scm b/gnu/packages/version-control.scm
index c3f501b4a4..6623285604 100644
--- a/gnu/packages/version-control.scm
+++ b/gnu/packages/version-control.scm
@@ -510,7 +510,7 @@ control to Git repositories.")
     (version "3.2.4")
     (source (origin
              (method url-fetch)
-             (uri (string-append "http://mercurial.selenic.com/release/mercurial-"
+             (uri (string-append "https://mercurial.selenic.com/release/mercurial-"
                                  version ".tar.gz"))
              (sha256
               (base32