diff --git a/tox.ini b/tox.ini
index 2c52966..eaedeb8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,7 @@ minversion = 3.3.0
 isolated_build = true
 
 [testenv]
-passenv = CI CIRCLECI CIRCLECI_*
+passenv = CI CIRCLECI CIRCLE_*
 deps =
     codecov
     opencv-python