diff --git a/.guix/modules/tiedote-md-service.scm b/.guix/modules/tiedote-md-service.scm
index 81de2c7..8ee89a2 100644
--- a/.guix/modules/tiedote-md-service.scm
+++ b/.guix/modules/tiedote-md-service.scm
@@ -86,6 +86,8 @@ the tiedote.md user on this system.")
                             )
                           #:user "tiedote.md"
                           #:group "tiedote.md"
+                          #:environment (cons "GIT_SSL_CAINFO=/etc/ssl/certs/ca-certificates.crt"
+                                              (default-environment-variable))
                           #:directory #$state-directory))))
             (stop #~(make-kill-destructor))))))