diff --git a/guix/channels.scm b/guix/channels.scm
index ad2442f50e..916d663e9f 100644
--- a/guix/channels.scm
+++ b/guix/channels.scm
@@ -783,7 +783,8 @@ modules in the old ~/.config/guix/latest style."
                    ;; derivation that builds modules.  We have to infer what the
                    ;; dependencies of these modules were.
                    (list guile-json-3 guile-git guile-bytestructures
-                         (ssh -> guile-ssh) (tls -> gnutls)))))
+                         (ssh -> guile-ssh) (tls -> gnutls))
+                   #:guile (default-guile))))
 
 (define (old-style-guix? drv)
   "Return true if DRV corresponds to a ~/.config/guix/latest style of
diff --git a/tests/channels.scm b/tests/channels.scm
index ba8cfe639e..1b6f640c4a 100644
--- a/tests/channels.scm
+++ b/tests/channels.scm
@@ -230,7 +230,6 @@
                                       #:current-channels (list new)
                                       #:validate-pull validate-pull)))))))
 
-(test-expect-fail 1)                    ;see: https://issues.guix.gnu.org/43940
 (test-assert "channel-instances->manifest"
   ;; Compute the manifest for a graph of instances and make sure we get a
   ;; derivation graph that mirrors the instance graph.  This test also ensures