diff --git a/tox.ini b/tox.ini
index 424dc5b..a700d4d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,8 @@
     .[test]
     ./vectors
 passenv = ARCHFLAGS LDFLAGS CFLAGS INCLUDE LIB LD_LIBRARY_PATH USERNAME
+setenv =
+    CRYPTOGRAPHY_ALLOW_OPENSSL_098=1
 commands =
     pip list
     python -c "from cryptography.hazmat.backends.openssl.backend import backend; print(backend.openssl_version_text())"