diff --git a/scripts-dev/lint.sh b/scripts-dev/lint.sh
index 6f08577..28e1693 100755
--- a/scripts-dev/lint.sh
+++ b/scripts-dev/lint.sh
@@ -8,7 +8,7 @@
 set -e
 
 files=(
-  "matrix_common"
+  "src"
   "tests"
 )
 
diff --git a/setup.cfg b/setup.cfg
index 8993c89..30ae78f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -11,6 +11,7 @@ classifiers =
 
 
 [options]
+package_dir = =src
 packages =
   matrix_common
 python_requires = >= 3.6
diff --git a/matrix_common/__init__.py b/src/matrix_common/__init__.py
similarity index 100%
rename from matrix_common/__init__.py
rename to src/matrix_common/__init__.py
diff --git a/matrix_common/py.typed b/src/matrix_common/py.typed
similarity index 100%
rename from matrix_common/py.typed
rename to src/matrix_common/py.typed
diff --git a/matrix_common/regex.py b/src/matrix_common/regex.py
similarity index 100%
rename from matrix_common/regex.py
rename to src/matrix_common/regex.py
diff --git a/matrix_common/versionstring.py b/src/matrix_common/versionstring.py
similarity index 100%
rename from matrix_common/versionstring.py
rename to src/matrix_common/versionstring.py
diff --git a/tox.ini b/tox.ini
index 952b7ea..65f797e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -25,13 +25,13 @@ commands =
 extras = dev
 
 commands =
-  flake8 matrix_common tests
-  black --check --diff matrix_common tests
-  isort --check-only --diff matrix_common tests
+  flake8 src tests
+  black --check --diff src tests
+  isort --check-only --diff src tests
 
 [testenv:check_types]
 
 extras = dev
 
 commands =
-  mypy matrix_common tests
+  mypy src tests