diff --git a/discord/guild.py b/discord/guild.py
index 60e8c9cd0..d25af2f09 100644
--- a/discord/guild.py
+++ b/discord/guild.py
@@ -4337,7 +4337,7 @@ class Guild(Hashable):
         """
         data = await self._state.http.modify_guild_onboarding(
             self.id,
-            prompts=[p.to_dict() for p in prompts] if prompts is not MISSING else None,
+            prompts=[p.to_dict(id=i) for i, p in enumerate(prompts)] if prompts is not MISSING else None,
             default_channel_ids=[c.id for c in default_channels] if default_channels is not MISSING else None,
             enabled=enabled if enabled is not MISSING else None,
             mode=mode.value if mode is not MISSING else None,
diff --git a/discord/onboarding.py b/discord/onboarding.py
index 50bfeddeb..4ca71b724 100644
--- a/discord/onboarding.py
+++ b/discord/onboarding.py
@@ -223,9 +223,9 @@ class PartialOnboardingPrompt:
         self.required: bool = required
         self.in_onboarding: bool = in_onboarding
 
-    def to_dict(self, *, id: int = MISSING) -> PromptPayload:
+    def to_dict(self, *, id: int) -> PromptPayload:
         return {
-            'id': id or os.urandom(16).hex(),
+            'id': id,
             'type': self.type.value,
             'title': self.title,
             'options': [option.to_dict() for option in self.options],
@@ -290,9 +290,6 @@ class OnboardingPrompt(PartialOnboardingPrompt, Hashable):
     def __repr__(self) -> str:
         return f'<OnboardingPrompt id={self.id} title={self.title}, type={self.type}>'
 
-    def to_dict(self) -> PromptPayload:
-        return super().to_dict(id=self.id)
-
 
 class Onboarding:
     """Represents a guild's onboarding configuration.