move some dashes around :)
diff --git a/.travis/run.sh b/.travis/run.sh
index 76d0445..6739c88 100755
--- a/.travis/run.sh
+++ b/.travis/run.sh
@@ -14,8 +14,8 @@
         # of OpenSSL, but we only need to run the
         # CommonCrypto backend tests once. Exclude
         # CommonCrypto when we test against brew OpenSSL
-        export TOX_FLAGS="-- --backend=openssl"
+        export TOX_FLAGS="--backend=openssl"
     fi
 fi
 source ~/.venv/bin/activate
-tox -e $TOX_ENV $TOX_FLAGS
+tox -e $TOX_ENV -- $TOX_FLAGS