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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"