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-rw-r--r--guix-build.in3
1 files changed, 2 insertions, 1 deletions
diff --git a/guix-build.in b/guix-build.in
index 19c1641838..ef9cf3bcc9 100644
--- a/guix-build.in
+++ b/guix-build.in
@@ -181,7 +181,8 @@ Report bugs to: ~a.~%") "@PACKAGE_BUGREPORT@"))
     ;; TODO: Add more options.
     (set-build-options %store
                        #:keep-failed? (assoc-ref opts 'keep-failed?)
-                       #:build-cores (or (assoc-ref opts 'cores) 1))
+                       #:build-cores (or (assoc-ref opts 'cores)
+                                         (current-processor-count)))
 
     (or (assoc-ref opts 'dry-run?)
         (and (build-derivations %store drv)