diff --git a/guix/ui.scm b/guix/ui.scm
index 2140c2e50b..94e2c4eecc 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -229,6 +229,8 @@ ARGS is the list of arguments received by the 'throw' handler."
      (let ((loc (source-properties->location properties)))
        (format (current-error-port) (_ "~a: error: ~a~%")
                (location->string loc) message)))
+    (('srfi-34 obj)
+     (report-error (_ "exception thrown: ~s~%") obj))
     ((error args ...)
      (report-error (_ "failed to load '~a':~%") file)
      (apply display-error frame (current-error-port) args))))
@@ -244,6 +246,9 @@ exiting.  ARGS is the list of arguments received by the 'throw' handler."
      (let ((loc (source-properties->location properties)))
        (format (current-error-port) (_ "~a: warning: ~a~%")
                (location->string loc) message)))
+    (('srfi-34 obj)
+     (warning (_ "failed to load '~a': exception thrown: ~s~%")
+              file obj))
     ((error args ...)
      (warning (_ "failed to load '~a':~%") file)
      (apply display-error #f (current-error-port) args))))
@@ -450,6 +455,8 @@ interpreted."
         (match args
           (('syntax-error proc message properties form . rest)
            (report-error (_ "syntax error: ~a~%") message))
+          (('srfi-34 obj)
+           (report-error (_ "exception thrown: ~s~%") obj))
           ((error args ...)
            (apply display-error #f (current-error-port) args))
           (what? #f))