diff --git a/noxfile.py b/noxfile.py
index 12c0333f7..72a6d0372 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -179,6 +179,9 @@ def unit_tests(session: nox.Session):
     template_path = _create_template_db(session)
     session.env["CLEVERAGENTS_TEMPLATE_DB"] = template_path
 
+    # Remove ANSI escape codes.
+    session.env["TERM"] = "dumb"
+
     behave_cmd = session.bin + "/behave-parallel"
     parallel_args = _behave_parallel_args(session.posargs)