diff --git a/src/nix/main.cc b/src/nix/main.cc
index 01a1e8b33c0..dddb757afac 100644
--- a/src/nix/main.cc
+++ b/src/nix/main.cc
@@ -427,7 +427,9 @@ void mainWrapped(int argc, char ** argv)
 
     evalSettings.pureEval = true;
 
+#ifndef _WIN32
     setLogFormat("bar");
+#endif
     settings.verboseBuild = false;
 
     // If on a terminal, progress will be displayed via progress bars etc. (thus verbosity=notice)