diff --git a/gnu/system/shadow.scm b/gnu/system/shadow.scm
index 47557191f8..0538fb1a24 100644
--- a/gnu/system/shadow.scm
+++ b/gnu/system/shadow.scm
@@ -251,7 +251,7 @@ (define (assert-unique-account-names users)
     (() *unspecified*)
     (duplicates
      (warning
-      (G_ "the following accounts appear more than once:~{ ~a~}")
+      (G_ "the following accounts appear more than once:~{ ~a~}~%")
       duplicates))))
 
 (define (assert-unique-group-names groups)
@@ -259,7 +259,7 @@ (define (assert-unique-group-names groups)
     (() *unspecified*)
     (duplicates
      (warning
-      (G_ "the following groups appear more than once:~{ ~a~}")
+      (G_ "the following groups appear more than once:~{ ~a~}~%")
       duplicates))))
 
 (define (assert-valid-users/groups users groups)