diff --git a/tests/functional/test_build_env.py b/tests/functional/test_build_env.py
index e31e728acc5..95f5bea278a 100644
--- a/tests/functional/test_build_env.py
+++ b/tests/functional/test_build_env.py
@@ -215,7 +215,7 @@ def test_build_env_isolation(script: PipTestEnvironment) -> None:
     run_with_build_env(
         script,
         "",
-        r"""
+        R"""
         from distutils.sysconfig import get_python_lib
         import sys