diff --git a/gnu/build/linux-container.scm b/gnu/build/linux-container.scm
index 3870b50907..4a8bed5a9a 100644
--- a/gnu/build/linux-container.scm
+++ b/gnu/build/linux-container.scm
@@ -44,7 +44,7 @@
   (let ((userns-file "/proc/sys/kernel/unprivileged_userns_clone"))
     (if (file-exists? userns-file)
         (eqv? #\1 (call-with-input-file userns-file read-char))
-        #f)))
+        #t)))
 
 (define (setgroups-supported?)
   "Return #t if the setgroups proc file, introduced in Linux-libre 3.19,