diff --git a/tox.ini b/tox.ini
index db3fcd4..61eed7e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -78,7 +78,7 @@ commands =
     {toxinidir}/tests/installtest.sh
 
 [testenv:pytest]
-depends = version.py ruff-format
+depends = version.py, ruff-format
 deps =
     pytest == {[tox]pytest_version}
     pytest-avoidance == 0.3.0
@@ -89,7 +89,7 @@ commands =
 
 [testenv:package]
 # Create {toxinidir}/px.pex
-depends = version.py ruff-format
+depends = version.py, ruff-format
 allowlist_externals = {toxinidir}/devbin/make-executable-zip.sh
 deps =
     # Used by the make-executable-zip.sh script
@@ -112,7 +112,7 @@ commands =
 
 [testenv:test-wheel]
 # Test installing using pip
-depends = version.py ruff-format
+depends = version.py, ruff-format
 allowlist_externals =
     /bin/bash
     /bin/rm