diff --git a/example/hello-world.project/docker-compose.yml b/example/hello_world/docker-compose.yml
similarity index 100%
rename from example/hello-world.project/docker-compose.yml
rename to example/hello_world/docker-compose.yml
diff --git a/example/hello-world.project/web/Dockerfile b/example/hello_world/web/Dockerfile
similarity index 100%
rename from example/hello-world.project/web/Dockerfile
rename to example/hello_world/web/Dockerfile
diff --git a/example/hello-world.project/web/index.html b/example/hello_world/web/index.html
similarity index 100%
rename from example/hello-world.project/web/index.html
rename to example/hello_world/web/index.html
diff --git a/example/kiwi.yml b/example/kiwi.yml
index 581505a..a9f55fa 100644
--- a/example/kiwi.yml
+++ b/example/kiwi.yml
@@ -8,7 +8,7 @@ shells:
   - /bin/bash
 
 projects:
-  - name: hello-world.project
+  - name: hello_world
     enabled: true
 
 storage:
diff --git a/tests/test_instance.py b/tests/test_instance.py
index 1a5beb3..4b7f9a5 100644
--- a/tests/test_instance.py
+++ b/tests/test_instance.py
@@ -12,7 +12,7 @@ class TestDefault:
 
         pc = i.config.projects[0]
 
-        assert pc.name == "hello-world.project"
+        assert pc.name == "hello_world"
 
     def test_empty(self):
         i = Instance()
diff --git a/tests/test_project.py b/tests/test_project.py
index 79531ba..8234e32 100644
--- a/tests/test_project.py
+++ b/tests/test_project.py
@@ -12,7 +12,7 @@ class TestDefault:
 
     def test_example(self):
         p = Project(
-            directory=Path("example/hello-world.project"),
+            directory=Path("example/hello_world"),
             parent_instance=None,
         )