diff --git a/src/main/python/ddadevops/c4k_mixin.py b/src/main/python/ddadevops/c4k_mixin.py
index 033eb36..45fd185 100644
--- a/src/main/python/ddadevops/c4k_mixin.py
+++ b/src/main/python/ddadevops/c4k_mixin.py
@@ -30,7 +30,7 @@ def add_c4k_mixin_config(config,
 class C4kMixin(DevopsBuild):
     def __init__(self, project, config):
         super().__init__(project, config)
-        self.c4k_build = C4kBuild(project, config)
+        self.c4k_build = C4kBuild(self.build, project, config)
         self.c4k_build_service = C4kBuildService()
 
     def write_c4k_config(self):
diff --git a/src/main/python/ddadevops/domain.py b/src/main/python/ddadevops/domain.py
index 684c999..3a5f860 100644
--- a/src/main/python/ddadevops/domain.py
+++ b/src/main/python/ddadevops/domain.py
@@ -48,7 +48,7 @@ class Build(Validateable):
     def __get_keys__(self, keys):
         result = {}
         for key in keys:
-            result[key] = self.get(key)
+            result[key] = self.__get__(key)
         return result
 
 
@@ -69,8 +69,8 @@ class DockerBuild(Validateable):
 
 
 class C4kBuild(Validateable):
-    def __init__(self, project, config):
-        self.build = Build(project, config)
+    def __init__(self, build: Build, project, config):
+        self.build = build
         self.c4k_mixin_config = config["C4kMixin"]["Config"]
         self.c4k_mixin_auth = config["C4kMixin"]["Auth"]
         tmp = self.c4k_mixin_config["mon-cfg"]
diff --git a/src/test/python/test_c4k_mixin.py b/src/test/python/test_c4k_mixin.py
index 646d751..bd8d60f 100644
--- a/src/test/python/test_c4k_mixin.py
+++ b/src/test/python/test_c4k_mixin.py
@@ -37,11 +37,11 @@ def test_c4k_mixin(tmp_path):
     mixin.build.update_runtime_config('test.de', None, None)
 
     mixin.write_c4k_config()
-    assert 'fqdn' in mixin.c4k_mixin_config
-    assert 'mon-cfg' in mixin.c4k_mixin_config
+    assert 'fqdn' in mixin.c4k_build.config()
+    assert 'mon-cfg' in mixin.c4k_build.config()
     assert os.path.exists(f'{mixin.build_path()}/out_c4k_config.yaml')
 
     mixin.write_c4k_auth()
-    assert 'mon-auth' in mixin.c4k_mixin_auth
+    assert 'mon-auth' in mixin.c4k_build.c4k_mixin_auth
     assert os.path.exists(f'{mixin.build_path()}/out_c4k_auth.yaml')
     
\ No newline at end of file
diff --git a/src/test/python/test_domain.py b/src/test/python/test_domain.py
index 371b69c..dbbe8d2 100644
--- a/src/test/python/test_domain.py
+++ b/src/test/python/test_domain.py
@@ -1,5 +1,5 @@
 from pybuilder.core import Project
-from src.main.python.ddadevops.domain import Validateable, C4kBuild
+from src.main.python.ddadevops.domain import Validateable, C4kBuild, Build
 from src.main.python.ddadevops.c4k_mixin import add_c4k_mixin_config
 
 
@@ -62,7 +62,7 @@ def test_c4k_build_should_update_fqdn(tmp_path):
         grafana_cloud_user="user",
         grafana_cloud_password="password",
     )
-    sut = C4kBuild(project, project_config)
+    sut = C4kBuild(Build(project, project_config), project, project_config)
     sut.update_runtime_config('test.de', None, None)
 
     assert {