diff --git a/tests/builders.scm b/tests/builders.scm
index f609631ae7..0b5577c7a3 100644
--- a/tests/builders.scm
+++ b/tests/builders.scm
@@ -49,6 +49,9 @@ (define %store
 (define url-fetch*
   (store-lower url-fetch))
 
+;; Globally disable grafts because they can trigger early builds.
+(%graft? #f)
+
 
 (test-begin "builders")