diff --git a/src/pybamm/config.py b/src/pybamm/config.py
index 865dd0a4dd..d3f4ab70a2 100644
--- a/src/pybamm/config.py
+++ b/src/pybamm/config.py
@@ -28,7 +28,7 @@ def is_running_tests():  # pragma: no cover
         "CIRCLECI",
         "JENKINS_URL",
         "GITLAB_CI",
-        "CIBW_ENVIRONMENT",
+        "CIBW_TEST_COMMAND",
     ]
     if any(var in os.environ for var in ci_env_vars):
         return True