diff --git a/tools/test_build_system/test_idf_extension.py b/tools/test_build_system/test_idf_extension.py
index 123c996507f..8783f3daf57 100644
--- a/tools/test_build_system/test_idf_extension.py
+++ b/tools/test_build_system/test_idf_extension.py
@@ -38,6 +38,9 @@ version = "0.1.0"
 
 [project.entry-points.idf_extension]
 {entry_point_name} = "{declarative_value}"
+
+[tool.setuptools]
+packages = ["test_extension_package_{suffix}"]
 """