diff --git a/tox.ini b/tox.ini
index d2e9f45..423e9f5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,6 @@ setenv =
     dev: SENTRY_ENVIRONMENT = {env:SENTRY_ENVIRONMENT:dev}
     dev: NEW_RELIC_APP_NAME = {env:NEW_RELIC_APP_NAME:gh-pr-upsert}
     dev: NEW_RELIC_ENVIRONMENT = {env:NEW_RELIC_ENVIRONMENT:dev}
-    dev,tests,functests: PYTHONDEVMODE = {env:PYTHONDEVMODE:1}
     tests: COVERAGE_FILE = {env:COVERAGE_FILE:.coverage.{envname}}
 passenv =
     HOME