diff --git a/guix/ssh.scm b/guix/ssh.scm
index 2b286a67b2..9b9baf54ea 100644
--- a/guix/ssh.scm
+++ b/guix/ssh.scm
@@ -33,6 +33,7 @@
   #:use-module (srfi srfi-34)
   #:use-module (srfi srfi-35)
   #:use-module (ice-9 match)
+  #:use-module (ice-9 format)
   #:use-module (ice-9 binary-ports)
   #:export (open-ssh-session
             remote-inferior