diff --git a/discord/models.py b/discord/models.py
index 66ee378..b16cdce 100644
--- a/discord/models.py
+++ b/discord/models.py
@@ -1,4 +1,4 @@
-from pydantic import BaseModel
+from pydantic import BaseModel, NonNegativeInt
 from pypresence.types import ActivityType
 from typing import Optional
 
@@ -9,6 +9,6 @@ class DiscordRPCUpdatePayload(BaseModel):
     subtitle: str
     image_url: str
     details: str
-    start: Optional[int]
-    end: Optional[int]
+    start: Optional[NonNegativeInt]
+    end: Optional[NonNegativeInt]
     activity_type: ActivityType
diff --git a/jellyfin/models.py b/jellyfin/models.py
index d24a1d5..de467b4 100644
--- a/jellyfin/models.py
+++ b/jellyfin/models.py
@@ -1,4 +1,4 @@
-from pydantic import BaseModel, HttpUrl
+from pydantic import BaseModel, HttpUrl, NonNegativeInt
 from enum import StrEnum
 from typing import Optional, Union
 from discord.models import DiscordRPCUpdatePayload
@@ -29,8 +29,8 @@ class JellyfinMediaItem(BaseModel):
     name: str
     type: JellyfinMediaType
     image_url: HttpUrl
-    start: Optional[int]
-    end: Optional[int]
+    start: Optional[NonNegativeInt]
+    end: Optional[NonNegativeInt]
     metadata: Union[JellyfinMusicMediaMetadata,
                     JellyfinMovieMediaMetadata,
                     JellyfinEpisodeMediaMetadata]