diff --git a/tox.ini b/tox.ini
index c224169..e009578 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,7 @@ skip_missing_interpreters = true
 [docker:sqlserver]
 image = mcr.microsoft.com/mssql/server:2019-latest
 expose =
-  SQLSERVER_PORT=SQLSERVER_1433_TCP_PORT
+  SQLSERVER_1433_TCP_PORT=1433/tcp
 environment =
     ACCEPT_EULA=y
     MSSQL_SA_PASSWORD=testDatabase1