diff --git a/speedtest/models.py b/speedtest/models.py
index cce2ebb..89b520e 100644
--- a/speedtest/models.py
+++ b/speedtest/models.py
@@ -62,11 +62,11 @@ class Server(BaseModel):
     port: int
     ip: str
 
-class Result:
+class Result(BaseModel):
     id: str
     url: str
     persisted: bool
 
     @property
-    def image(self):
+    def image(self) -> str:
         return self.url + ".png"