diff --git a/tox.ini b/tox.ini
index 742fd9c8..0a198d6a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,7 +29,7 @@ setenv = OS_PATH_TEST = ./freezer_api/tests/unit
 commands =
     find . -type f -name "*.py[c|o]" -delete
     rm -rf .testrepository
-    python setup.py test --coverage --coverage-package-name freezer_api --testr-args="{posargs}"
+    python setup.py test --coverage --coverage-package-name freezer_api --testr-args={posargs}
     coverage report -m
     rm -f .coverage
     rm -rf .testrepository
@@ -40,7 +40,7 @@ setenv = OS_PATH_TEST = ./freezer_api/tests/unit
 commands =
     find . -type f -name "*.py[c|o]" -delete
     rm -rf .testrepository
-    python setup.py test --coverage --coverage-package-name freezer_api --testr-args="{posargs}"
+    python setup.py test --coverage --coverage-package-name freezer_api --testr-args={posargs}
     coverage report -m
     rm -f .coverage
     rm -rf .testrepository
@@ -51,7 +51,7 @@ setenv = OS_PATH_TEST = ./freezer_api/tests/unit
 commands =
     find . -type f -name "*.py[c|o]" -delete
     rm -rf .testrepository
-    python setup.py test --coverage --coverage-package-name freezer_api --testr-args="{posargs}"
+    python setup.py test --coverage --coverage-package-name freezer_api --testr-args={posargs}
     coverage report -m
     rm -f .coverage
     rm -rf .testrepository
@@ -64,7 +64,7 @@ commands = {posargs}
 basepython = python3
 commands =
     find . -type f -name "*.py[c|o]" -delete
-    python setup.py test --coverage --coverage-package-name freezer_api --testr-args="{posargs}"
+    python setup.py test --coverage --coverage-package-name freezer_api --testr-args={posargs}
     coverage report -m
     rm -f .coverage
     rm -rf .testrepository