diff --git a/pyproject.toml b/pyproject.toml
index fa158eaa..a5186be1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -113,7 +113,7 @@ solvers = [
 ]
 
 [tool.setuptools.packages.find]
-include = ["linopy"]
+include = ["linopy", "linopy.*"]
 
 [tool.setuptools.package-data]
 "linopy" = ["py.typed"]