diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index 9c09767508..6977a57844 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -550,7 +550,7 @@ (define* (system-derivation-for-action os action
                                             #:disk-image-size
                                             (if full-boot?
                                                 image-size
-                                                (* 30 (expt 2 20)))
+                                                (* 70 (expt 2 20)))
                                             #:mappings mappings))
     ((disk-image)
      (system-disk-image os #:disk-image-size image-size))))