diff --git a/scripts/nix-build.in b/scripts/nix-build.in
index d27eb08e22..ed85d57121 100644
--- a/scripts/nix-build.in
+++ b/scripts/nix-build.in
@@ -102,7 +102,7 @@ EOF
         $n += 2;
     }
 
-    elsif ($arg eq "--max-jobs" or $arg eq "-j" or $arg eq "--max-silent-time" or $arg eq "--log-type") {
+    elsif ($arg eq "--max-jobs" or $arg eq "-j" or $arg eq "--max-silent-time" or $arg eq "--log-type" or $arg eq "--cores") {
         $n++;
         die "$0: `$arg' requires an argument\n" unless $n < scalar @ARGV;
         push @buildArgs, ($arg, $ARGV[$n]);