diff --git a/.appveyor.yml b/.appveyor.yml
index 339342aed..8a83b478a 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -25,7 +25,7 @@ install:
   - "pip install -U tox"
 
 test_script:
-  - ps: "tox -- --cov netlib --cov mitmproxy --cov pathod | Select-String -NotMatch Cryptography_locking_cb"
+  - ps: "tox --recreate -- --cov netlib --cov mitmproxy --cov pathod | Select-String -NotMatch Cryptography_locking_cb"
 
 deploy_script:
   ps: |