diff --git a/fluent.runtime/setup.cfg b/fluent.runtime/setup.cfg
index e26910c6..b721e30e 100644
--- a/fluent.runtime/setup.cfg
+++ b/fluent.runtime/setup.cfg
@@ -3,6 +3,3 @@ version=0.4.0
 
 [bdist_wheel]
 universal=1
-
-[mypy]
-strict = True
diff --git a/fluent.syntax/setup.cfg b/fluent.syntax/setup.cfg
index 7109a307..2ee441e6 100644
--- a/fluent.syntax/setup.cfg
+++ b/fluent.syntax/setup.cfg
@@ -3,6 +3,3 @@ version=0.19.0
 
 [bdist_wheel]
 universal=1
-
-[mypy]
-strict = True
diff --git a/pyproject.toml b/pyproject.toml
index 3f3a00ee..7156c53b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,6 @@
 [tool.isort]
 line_length = 120
 skip_glob = ".tox"
+
+[tool.mypy]
+strict = true