diff --git a/run-tests.nix b/run-tests.nix
index f6f33ee..189198e 100644
--- a/run-tests.nix
+++ b/run-tests.nix
@@ -8,15 +8,15 @@
 writeScript "run-tests" ''
   set -e
   PATH="''${PATH}''${PATH:+":"}${direnv}/bin"
-  echo -e "\x1b[32m## run shellcheck\x1b[0m"
+  echo run shellcheck
   ${shellcheck}/bin/shellcheck direnvrc
-  echo -e "\x1b[32m## run black\x1b[0m"
+  echo run black
   LC_ALL=en_US.utf-8 ${python3.pkgs.black}/bin/black --check .
-  echo -e "\x1b[32m## run flake8\x1b[0m"
+  echo run flake8
   ${python3.pkgs.flake8}/bin/flake8 --ignore E501 tests
-  echo -e "\x1b[32m## run mypy\x1b[0m"
+  echo run mypy
   ${mypy}/bin/mypy tests
 
-  echo -e "\x1b[32m## run unittest\x1b[0m"
+  echo run unittest
   ${python3.pkgs.pytest}/bin/pytest .
 ''