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-rw-r--r--build-aux/cuirass/evaluate.scm3
1 files changed, 2 insertions, 1 deletions
diff --git a/build-aux/cuirass/evaluate.scm b/build-aux/cuirass/evaluate.scm
index 5beac1b37c..7ae5c266d1 100644
--- a/build-aux/cuirass/evaluate.scm
+++ b/build-aux/cuirass/evaluate.scm
@@ -85,7 +85,8 @@
                                    (open-inferior (derivation->output-path derivation)))
                                  %cuirass-supported-systems)))
              (n-par-for-each
-              (/ (current-processor-count) 2)
+              (min (length %cuirass-supported-systems)
+                   (current-processor-count))
               (lambda (system inferior)
                 (with-store store
                   (let ((channels (map channel-instance->sexp instances)))