diff --git a/pkgs/tools/security/tor/tor-arm.nix b/pkgs/tools/security/tor/tor-arm.nix
index a36e53c06527..6c4d61d825f9 100644
--- a/pkgs/tools/security/tor/tor-arm.nix
+++ b/pkgs/tools/security/tor/tor-arm.nix
@@ -37,8 +37,8 @@ stdenv.mkDerivation rec {
     for i in $(cd $out/bin && ls); do
       wrapProgram $out/bin/$i \
         --prefix PYTHONPATH : "$(toPythonPath $out):$(toPythonPath ${pythonPackages.curses}):$out/libexec:$PYTHONPATH" \
-	--set TERMINFO "${ncurses}/share/terminfo" \
-	--set TERM     "xterm"
+        --set TERMINFO "${ncurses}/share/terminfo" \
+        --set TERM     "xterm"
     done
   '';