diff --git a/guix/scripts/environment.scm b/guix/scripts/environment.scm
index fc75d78611..0ec2c5d3cb 100644
--- a/guix/scripts/environment.scm
+++ b/guix/scripts/environment.scm
@@ -425,6 +425,9 @@ (define* (launch-environment/container #:key command bash user-mappings
             (mkdir-p "/bin")
             (symlink bash "/bin/sh")
 
+            ;; Set a reasonable default PS1.
+            (setenv "PS1" "\\u@\\h \\w [env]\\$ ")
+
             ;; Setup directory for temporary files.
             (mkdir-p "/tmp")
             (for-each (lambda (var)