diff --git a/gnu/services/cuirass.scm b/gnu/services/cuirass.scm
index 187766bc99..f9f6355b98 100644
--- a/gnu/services/cuirass.scm
+++ b/gnu/services/cuirass.scm
@@ -184,7 +184,8 @@ (define (cuirass-shepherd-service config)
                         #$@extra-options)
 
                   #:environment-variables
-                  (list "GIT_SSL_CAINFO=/etc/ssl/certs/ca-certificates.crt"
+                  (list "LC_ALL=C.UTF-8"
+                        "GIT_SSL_CAINFO=/etc/ssl/certs/ca-certificates.crt"
                         (string-append "GIT_EXEC_PATH=" #$git
                                        "/libexec/git-core"))