1 files changed, 8 insertions, 8 deletions
diff --git a/tox.ini b/tox.ini
index 956e3cf77..c094150e6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -47,21 +47,21 @@ setenv=
     PYTHONNOUSERSITE=1
     BASECOMMAND=python -m pytest
 
-    WORKERS=-n4
-    oracle: WORKERS=-n2
+    WORKERS={env:WORKERS:-n4}
+    oracle: WORKERS={env:WORKERS:-n2}
     nocext: DISABLE_SQLALCHEMY_CEXT=1
     cov: COVERAGE={[testenv]cov_args}
-    sqlite: SQLITE=--db sqlite
-    postgresql: POSTGRESQL=--db postgresql
-    mysql: MYSQL=--db mysql --db pymysql
-    oracle: ORACLE=--db oracle --write-idents oracle_idents.txt --exclude-tag memory-intensive
-    mssql: MSSQL=--db pyodbc --db pymssql
+    sqlite: SQLITE={env:SQLITE:--db sqlite}
+    postgresql: POSTGRESQL={env:POSTGRESQL:--db postgresql}
+    mysql: MYSQL={env:MYSQL:--db mysql --db pymysql}
+    oracle: ORACLE={env:ORACLE:--db oracle} --write-idents oracle_idents.txt --exclude-tag memory-intensive
+    mssql: MSSQL={env:MSSQL:--db pyodbc --db pymssql}
     backendonly: BACKENDONLY=--backend-only
 
 # tox as of 2.0 blocks all environment variables from the
 # outside, unless they are here (or in TOX_TESTENV_PASSENV,
 # wildcards OK).  Need at least these
-passenv=ORACLE_HOME NLS_LANG
+passenv=ORACLE_HOME NLS_LANG POSTGRESQL MYSQL ORACLE MSSQL SQLITE WORKERS
 
 # for nocext, we rm *.so in lib in case we are doing usedevelop=True
 commands=