diff --git a/fastapi_users/models.py b/fastapi_users/models.py
index 193b95c0..9f75bd3f 100644
--- a/fastapi_users/models.py
+++ b/fastapi_users/models.py
@@ -1,7 +1,7 @@
 import uuid
 from typing import List, Optional, TypeVar
 
-from pydantic import UUID4, BaseModel, EmailStr, validator
+from pydantic import Field, UUID4, BaseModel, EmailStr
 
 
 class CreateUpdateDictModel(BaseModel):
@@ -24,16 +24,12 @@ class CreateUpdateDictModel(BaseModel):
 class BaseUser(CreateUpdateDictModel):
     """Base User model."""
 
-    id: Optional[UUID4] = None
+    id: UUID4 = Field(default_factory=uuid.uuid4)
     email: Optional[EmailStr] = None
     is_active: Optional[bool] = True
     is_superuser: Optional[bool] = False
     is_verified: Optional[bool] = False
 
-    @validator("id", pre=True, always=True)
-    def default_id(cls, v):
-        return v or uuid.uuid4()
-
 
 class BaseUserCreate(CreateUpdateDictModel):
     email: EmailStr
@@ -48,7 +44,6 @@ class BaseUserUpdate(BaseUser):
 
 
 class BaseUserDB(BaseUser):
-    id: UUID4
     email: EmailStr
     is_active: bool
     is_superuser: bool
@@ -65,7 +60,7 @@ UD = TypeVar("UD", bound=BaseUserDB)
 class BaseOAuthAccount(BaseModel):
     """Base OAuth account model."""
 
-    id: Optional[UUID4] = None
+    id: UUID4 = Field(default_factory=uuid.uuid4)
     oauth_name: str
     access_token: str
     expires_at: Optional[int] = None
@@ -73,10 +68,6 @@ class BaseOAuthAccount(BaseModel):
     account_id: str
     account_email: str
 
-    @validator("id", pre=True, always=True)
-    def default_id(cls, v):
-        return v or uuid.uuid4()
-
     class Config:
         orm_mode = True