diff --git a/joystick_diagrams/input/device.py b/joystick_diagrams/input/device.py
index a02f7a8..951bbb4 100644
--- a/joystick_diagrams/input/device.py
+++ b/joystick_diagrams/input/device.py
@@ -57,7 +57,7 @@ def validate_guid(guid: str) -> str:
         """
 
         try:
-            return UUID(guid.strip()).__str__()
+            return str(UUID(guid.strip()))
         except ValueError as e:
             raise ValueError(f"GUID {guid} is not valid: {e}") from e
 
diff --git a/joystick_diagrams/input/input.py b/joystick_diagrams/input/input.py
index ce56790..42ec44e 100644
--- a/joystick_diagrams/input/input.py
+++ b/joystick_diagrams/input/input.py
@@ -28,7 +28,7 @@ def __repr__(self):
         return f"{self.input_control} - {self.command} - {self.modifiers}"
 
     def __str__(self):
-        mod_to_string = [x.__str__() for x in self.modifiers]
+        mod_to_string = [str(x) for x in self.modifiers]
         return f"{self.command} - {str(mod_to_string)}"
 
     def __post_init__(self):