diff --git a/tox.ini b/tox.ini
index feb328e0..9a8b3fc9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,7 +29,7 @@ python =
 deps =
     pytest
     pytest-timeout
-commands = {envpython} run_tests
+commands = {envpython} run_tests {posargs}
 setenv =
     GIT_AUTHOR_NAME = Repo test author
     GIT_COMMITTER_NAME = Repo test committer