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-rw-r--r--pkgs/development/tools/misc/hydra/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/tools/misc/hydra/default.nix b/pkgs/development/tools/misc/hydra/default.nix
index e0ebba4c051..3e5c12e183a 100644
--- a/pkgs/development/tools/misc/hydra/default.nix
+++ b/pkgs/development/tools/misc/hydra/default.nix
@@ -102,7 +102,7 @@ in stdenv.mkDerivation rec {
 
   configureFlags = [ "--with-docbook-xsl=${docbook_xsl}/xml/xsl/docbook" ];
 
-  NIX_CFLAGS_COMPILE = [ "-pthread" ];
+  NIX_CFLAGS_COMPILE = "-pthread";
 
   shellHook = ''
     PATH=$(pwd)/src/script:$(pwd)/src/hydra-eval-jobs:$(pwd)/src/hydra-queue-runner:$(pwd)/src/hydra-evaluator:$PATH