diff --git a/pyproject.toml b/pyproject.toml
index ed330fcd..a362344b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -119,5 +119,8 @@ source = ["nowcast", "tests"]
 show_missing = true
 
 
+[tool.hatch.build.targets.wheel]
+packages = ["nowcast"]
+
 [tool.hatch.version]
 path = "nowcast/__about__.py"