1 files changed, 2 insertions, 1 deletions
diff --git a/src/nix/main.cc b/src/nix/main.cc
index 0990549aeecd..9781b58544fe 100644
--- a/src/nix/main.cc
+++ b/src/nix/main.cc
@@ -84,7 +84,8 @@ void mainWrapped(int argc, char * * argv)
 
     if (!args.command) args.showHelpAndExit();
 
-    StartProgressBar bar;
+    if (isatty(STDERR_FILENO))
+        startProgressBar();
 
     args.command->prepare();
     args.command->run();