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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 a4f1a96c6a4c..e3d2c4950bcd 100644
--- a/pkgs/development/tools/misc/hydra/default.nix
+++ b/pkgs/development/tools/misc/hydra/default.nix
@@ -118,7 +118,7 @@ in releaseTools.nixBuild rec {
 
   preCheck = ''
     patchShebangs .
-    export LOGNAME=${LOGNAME:-foo}
+    export LOGNAME=''${LOGNAME:-foo}
   '';
 
   postInstall = ''