---
 modules/services/misc/nix-daemon.nix |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/modules/services/misc/nix-daemon.nix 
b/modules/services/misc/nix-daemon.nix
index 214e091..c801455 100644
--- a/modules/services/misc/nix-daemon.nix
+++ b/modules/services/misc/nix-daemon.nix
@@ -242,6 +242,7 @@ in
           ''
             export PATH=${if config.nix.distributedBuilds then 
"${pkgs.openssh}/bin:${pkgs.gzip}/bin:" else 
""}${pkgs.openssl}/bin:${nix}/bin:$PATH
             ${config.nix.envVars}
+            export NUM_CORES=$(${pkgs.coreutils}/bin/nproc)
             exec \
               nice -n ${builtins.toString config.nix.daemonNiceLevel} \
               ${pkgs.utillinux}/bin/ionice -n ${builtins.toString 
config.nix.daemonIONiceLevel} \
-- 
1.6.6.2

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