diff --git a/packages/twenty-server/src/modules/workspace-member/standard-objects/workspace-member.workspace-entity.ts b/packages/twenty-server/src/modules/workspace-member/standard-objects/workspace-member.workspace-entity.ts
index a31ff6156a..1bf9c12c45 100644
--- a/packages/twenty-server/src/modules/workspace-member/standard-objects/workspace-member.workspace-entity.ts
+++ b/packages/twenty-server/src/modules/workspace-member/standard-objects/workspace-member.workspace-entity.ts
@@ -4,10 +4,10 @@ import { msg } from '@lingui/core/macro';
 import { APP_LOCALES, SOURCE_LOCALE } from 'twenty-shared/translations';
 import { FieldMetadataType } from 'twenty-shared/types';
 
+import { NumberDataType } from 'src/engine/metadata-modules/field-metadata/interfaces/field-metadata-settings.interface';
 import { RelationOnDeleteAction } from 'src/engine/metadata-modules/field-metadata/interfaces/relation-on-delete-action.interface';
 import { RelationType } from 'src/engine/metadata-modules/field-metadata/interfaces/relation-type.interface';
 import { Relation } from 'src/engine/workspace-manager/workspace-sync-metadata/interfaces/relation.interface';
-import { NumberDataType } from 'src/engine/metadata-modules/field-metadata/interfaces/field-metadata-settings.interface';
 
 import { SEARCH_VECTOR_FIELD } from 'src/engine/metadata-modules/constants/search-vector-field.constants';
 import { FullNameMetadata } from 'src/engine/metadata-modules/field-metadata/composite-types/full-name.composite-type';
@@ -19,6 +19,7 @@ import { WorkspaceField } from 'src/engine/twenty-orm/decorators/workspace-field
 import { WorkspaceIsNullable } from 'src/engine/twenty-orm/decorators/workspace-is-nullable.decorator';
 import { WorkspaceIsSearchable } from 'src/engine/twenty-orm/decorators/workspace-is-searchable.decorator';
 import { WorkspaceIsSystem } from 'src/engine/twenty-orm/decorators/workspace-is-system.decorator';
+import { WorkspaceIsUnique } from 'src/engine/twenty-orm/decorators/workspace-is-unique.decorator';
 import { WorkspaceRelation } from 'src/engine/twenty-orm/decorators/workspace-relation.decorator';
 import { WORKSPACE_MEMBER_STANDARD_FIELD_IDS } from 'src/engine/workspace-manager/workspace-sync-metadata/constants/standard-field-ids';
 import { STANDARD_OBJECT_ICONS } from 'src/engine/workspace-manager/workspace-sync-metadata/constants/standard-object-icons';
@@ -134,6 +135,7 @@ export class WorkspaceMemberWorkspaceEntity extends BaseWorkspaceEntity {
   @WorkspaceIsSystem()
   avatarUrl: string;
 
+  @WorkspaceIsUnique()
   @WorkspaceField({
     standardId: WORKSPACE_MEMBER_STANDARD_FIELD_IDS.userEmail,
     type: FieldMetadataType.TEXT,