diff --git a/cura/QualityManager.py b/cura/QualityManager.py
index d7b2c7d705..f0f095b912 100644
--- a/cura/QualityManager.py
+++ b/cura/QualityManager.py
@@ -16,9 +16,9 @@ class QualityManager:
 
     ##  Get the singleton instance for this class.
     @classmethod
-    def getInstance(cls):
+    def getInstance(cls) -> "QualityManager":
         # Note: Explicit use of class name to prevent issues with inheritance.
-        if QualityManager.__instance is None:
+        if not QualityManager.__instance:
             QualityManager.__instance = cls()
         return QualityManager.__instance
 
diff --git a/cura/Settings/ProfilesModel.py b/cura/Settings/ProfilesModel.py
index 404bb569a5..9056273216 100644
--- a/cura/Settings/ProfilesModel.py
+++ b/cura/Settings/ProfilesModel.py
@@ -32,9 +32,9 @@ class ProfilesModel(InstanceContainersModel):
 
     ##  Get the singleton instance for this class.
     @classmethod
-    def getInstance(cls):
+    def getInstance(cls) -> "ProfilesModel":
         # Note: Explicit use of class name to prevent issues with inheritance.
-        if ProfilesModel.__instance is None:
+        if not ProfilesModel.__instance:
             ProfilesModel.__instance = cls()
         return ProfilesModel.__instance