diff --git a/packages/pinia-orm/src/model/Model.ts b/packages/pinia-orm/src/model/Model.ts
index d7a45b67b..b7f8901ff 100644
--- a/packages/pinia-orm/src/model/Model.ts
+++ b/packages/pinia-orm/src/model/Model.ts
@@ -826,11 +826,18 @@ export class Model {
 
       if (cast && operation === 'get') { value = cast.get(value) }
 
+      // Apply the cast before the field is filled so the type check
+      // validates the casted value instead of the raw input.
+      if (cast && operation === 'set' && value !== undefined) {
+        value = options.action === 'update' ? cast.get(value) : cast.set(value)
+      }
+
       let keyValue = this.$fillField(key, attr, value)
 
       if (mutator && typeof mutator !== 'function' && operation === 'set' && mutator.set) { keyValue = mutator.set(keyValue) }
 
-      if (cast && operation === 'set') {
+      // Values filled by the attribute default still need to pass the cast.
+      if (cast && operation === 'set' && value === undefined) {
         keyValue = options.action === 'update' ? cast.get(keyValue) : cast.set(keyValue)
       }
 
diff --git a/packages/pinia-orm/tests/unit/model/Model_Casts_Number.spec.ts b/packages/pinia-orm/tests/unit/model/Model_Casts_Number.spec.ts
index bb28bb388..50863739d 100644
--- a/packages/pinia-orm/tests/unit/model/Model_Casts_Number.spec.ts
+++ b/packages/pinia-orm/tests/unit/model/Model_Casts_Number.spec.ts
@@ -92,4 +92,34 @@ describe('unit/model/Model_Casts_Number', () => {
 
     expect(userRepo.find(1)?.count).toBe(444)
   })
+
+  it('should not warn about a wrong type when the cast converts the value on save', () => {
+    const warningSpy = vi.spyOn(console, 'warn')
+    warningSpy.mockClear()
+
+    class User extends Model {
+      static entity = 'users'
+
+      @Attr(0) id!: number
+
+      @Cast(() => NumberCast)
+      @Num(null)
+      count!: number | null
+    }
+
+    const userRepo = useRepo(User)
+    userRepo.save({
+      id: 1,
+      count: '10191',
+    })
+
+    assertState({
+      users: {
+        1: { id: 1, count: 10191 },
+      },
+    })
+
+    expect(userRepo.find(1)?.count).toBe(10191)
+    expect(warningSpy).not.toHaveBeenCalled()
+  })
 })