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-rw-r--r--gnu/packages/chez.scm4
1 files changed, 2 insertions, 2 deletions
diff --git a/gnu/packages/chez.scm b/gnu/packages/chez.scm
index b3aadf3a78..d47225dbe5 100644
--- a/gnu/packages/chez.scm
+++ b/gnu/packages/chez.scm
@@ -604,8 +604,8 @@ Chez Scheme.")))
(define makefile
(string-append (getcwd) "/Makefile"))
(define machine
- #$(chez-machine->threaded
- (nix-system->chez-machine)))
+ #$(and=> (nix-system->chez-machine)
+ chez-machine->threaded))
(with-directory-excursion
(search-input-directory outputs "/lib/stex")
(invoke "make"