diff --git a/cura/Settings/DatabaseHandlers/IntentDatabaseHandler.py b/cura/Settings/DatabaseHandlers/IntentDatabaseHandler.py
index 17ac715c39..33dc176ac8 100644
--- a/cura/Settings/DatabaseHandlers/IntentDatabaseHandler.py
+++ b/cura/Settings/DatabaseHandlers/IntentDatabaseHandler.py
@@ -19,4 +19,4 @@ class IntentDatabaseHandler(DatabaseMetadataContainerController):
                                              "version": "text",
                                              "setting_version": "text"
                                          }))
-        self.container_type = InstanceContainer
+        self._container_type = InstanceContainer
diff --git a/cura/Settings/DatabaseHandlers/QualityDatabaseHandler.py b/cura/Settings/DatabaseHandlers/QualityDatabaseHandler.py
index 5447c0ed62..a84f725587 100644
--- a/cura/Settings/DatabaseHandlers/QualityDatabaseHandler.py
+++ b/cura/Settings/DatabaseHandlers/QualityDatabaseHandler.py
@@ -19,7 +19,7 @@ class QualityDatabaseHandler(DatabaseMetadataContainerController):
                                              "version": "text",
                                              "setting_version": "text"
                                          }))
-        self.container_type = InstanceContainer
+        self._container_type = InstanceContainer
 
     def groomMetadata(self, metadata: metadata_type) -> metadata_type:
         """
diff --git a/cura/Settings/DatabaseHandlers/VariantDatabaseHandler.py b/cura/Settings/DatabaseHandlers/VariantDatabaseHandler.py
index 4173243afd..d8029c754f 100644
--- a/cura/Settings/DatabaseHandlers/VariantDatabaseHandler.py
+++ b/cura/Settings/DatabaseHandlers/VariantDatabaseHandler.py
@@ -16,4 +16,4 @@ class VariantDatabaseHandler(DatabaseMetadataContainerController):
                                              "version": "text",
                                              "setting_version": "text"
                                          }))
-        self.container_type = InstanceContainer
+        self._container_type = InstanceContainer