diff --git a/packages/schema/src/language-server/validator/datamodel-validator.ts b/packages/schema/src/language-server/validator/datamodel-validator.ts
index 0baf5ace3..b4e17e56c 100644
--- a/packages/schema/src/language-server/validator/datamodel-validator.ts
+++ b/packages/schema/src/language-server/validator/datamodel-validator.ts
@@ -361,6 +361,11 @@ export default class DataModelValidator implements AstValidator<DataModel> {
             const containingModel = field.$container as DataModel;
             const uniqueFieldList = getUniqueFields(containingModel);
 
+            // field is defined in the abstract base model
+            if (containingModel !== contextModel) {
+                uniqueFieldList.push(...getUniqueFields(contextModel));
+            }
+
             thisRelation.fields?.forEach((ref) => {
                 const refField = ref.target.ref as DataModelField;
                 if (refField) {
@@ -372,7 +377,7 @@ export default class DataModelValidator implements AstValidator<DataModel> {
                     }
                     accept(
                         'error',
-                        `Field "${refField.name}" is part of a one-to-one relation and must be marked as @unique or be part of a model-level @@unique attribute`,
+                        `Field "${refField.name}" on model "${containingModel.name}" is part of a one-to-one relation and must be marked as @unique or be part of a model-level @@unique attribute`,
                         { node: refField }
                     );
                 }
diff --git a/packages/schema/tests/schema/validation/datamodel-validation.test.ts b/packages/schema/tests/schema/validation/datamodel-validation.test.ts
index 0bf12245d..e0778da51 100644
--- a/packages/schema/tests/schema/validation/datamodel-validation.test.ts
+++ b/packages/schema/tests/schema/validation/datamodel-validation.test.ts
@@ -521,7 +521,7 @@ describe('Data Model Validation Tests', () => {
         `)
         ).toMatchObject(
             errorLike(
-                `Field "aId" is part of a one-to-one relation and must be marked as @unique or be part of a model-level @@unique attribute`
+                `Field "aId" on model "B" is part of a one-to-one relation and must be marked as @unique or be part of a model-level @@unique attribute`
             )
         );
 
@@ -736,6 +736,26 @@ describe('Data Model Validation Tests', () => {
         ).toMatchObject(
             errorLike(`The relation field "user" on model "A" is missing an opposite relation field on model "User"`)
         );
+
+        // one-to-one relation field and @@unique defined in different models
+        await loadModel(`
+                    ${prelude}
+
+                    abstract model Base {
+                        id String @id
+                        a A @relation(fields: [aId], references: [id])
+                        aId String
+                    }
+
+                    model A {
+                        id String @id
+                        b B?
+                    }
+        
+                    model B extends Base{
+                        @@unique([aId])
+                    }
+                `);
     });
 
     it('delegate base type', async () => {