diff --git a/pyproject.toml b/pyproject.toml
index 4c45c91..7a800b2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -61,6 +61,8 @@ path = "delphin/__about__.py"
 exclude = [
   "/.github",
 ]
+[tool.hatch.build.targets.wheel]
+packages = ["delphin"]
 
 [tool.hatch.envs.dev]
 dependencies = [