diff --git a/doc/guix.texi b/doc/guix.texi
index c10fc649d1..7b5b711793 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -2532,8 +2532,10 @@ Produce verbose output, writing build logs to the standard error output.
 @item --url=@var{url}
 Download Guix from the Git repository at @var{url}.
 
+@vindex GUIX_PULL_URL
 By default, the source is taken from its canonical Git repository at
-@code{gnu.org}, for the stable branch of Guix.
+@code{gnu.org}, for the stable branch of Guix.  To use a different source,
+set the @code{GUIX_PULL_URL} environment variable.
 
 @item --commit=@var{commit}
 Deploy @var{commit}, a valid Git commit ID represented as a hexadecimal
diff --git a/guix/scripts/pull.scm b/guix/scripts/pull.scm
index b1c87c870e..2400198000 100644
--- a/guix/scripts/pull.scm
+++ b/guix/scripts/pull.scm
@@ -82,7 +82,7 @@ Install it by running:
                (resolve-interface '(git))))
 
 (define %repository-url
-  "https://git.savannah.gnu.org/git/guix.git")
+  (or (getenv "GUIX_PULL_URL") "https://git.savannah.gnu.org/git/guix.git"))
 
 
 ;;;