diff --git a/packages/orm/src/client/crud/dialects/base-dialect.ts b/packages/orm/src/client/crud/dialects/base-dialect.ts
index 180405f31..f126cfeef 100644
--- a/packages/orm/src/client/crud/dialects/base-dialect.ts
+++ b/packages/orm/src/client/crud/dialects/base-dialect.ts
@@ -387,8 +387,9 @@ export abstract class BaseCrudDialect<Schema extends SchemaDef> {
             field,
             joinAlias,
         );
-        const baseJoin = this.eb
-            .selectFrom(`${fieldDef.type} as ${joinAlias}`)
+        // use `buildSelectModel` so that delegate base tables are joined - the filter may
+        // reference fields inherited from a base, which live on the base table
+        const baseJoin = this.buildSelectModel(fieldDef.type, joinAlias)
             .select(this.eb.lit(1).as('_'))
             .where(() =>
                 this.and(...joinPairs.map(([left, right]) => this.eb(this.eb.ref(left), '=', this.eb.ref(right)))),
diff --git a/tests/regression/test/issue-2768.test.ts b/tests/regression/test/issue-2768.test.ts
new file mode 100644
index 000000000..8a5b7a3a1
--- /dev/null
+++ b/tests/regression/test/issue-2768.test.ts
@@ -0,0 +1,94 @@
+import { createTestClient } from '@zenstackhq/testtools';
+import { describe, expect, it } from 'vitest';
+
+const schema = `
+model Location {
+    id        String     @id @default(cuid())
+    name      String
+    resources Resource[]
+}
+
+enum ResourceType {
+    DESK
+}
+
+model Resource {
+    id         String       @id @default(cuid())
+    name       String
+    type       ResourceType
+    locationId String
+    location   Location     @relation(fields: [locationId], references: [id], onDelete: Cascade)
+
+    @@delegate(type)
+}
+
+model ResourceDesk extends Resource {
+    employeeDeskSessions EmployeeDeskSession[]
+
+    @@delegateMap(DESK)
+}
+
+model EmployeeDeskSession {
+    id     String       @id @default(cuid())
+    deskId String
+    desk   ResourceDesk @relation(fields: [deskId], references: [id], onDelete: Cascade)
+}
+`;
+
+describe('Regression for issue 2768', () => {
+    async function createData() {
+        const db = await createTestClient(schema);
+
+        const l1 = await db.location.create({ data: { id: 'l1', name: 'l1' } });
+        const l2 = await db.location.create({ data: { id: 'l2', name: 'l2' } });
+
+        const desk1 = await db.resourceDesk.create({ data: { name: 'desk1', locationId: l1.id } });
+        const desk2 = await db.resourceDesk.create({ data: { name: 'desk2', locationId: l2.id } });
+
+        await db.employeeDeskSession.create({ data: { id: 's1', deskId: desk1.id } });
+        await db.employeeDeskSession.create({ data: { id: 's2', deskId: desk2.id } });
+
+        return db;
+    }
+
+    it('filters a to-one relation by a base-model foreign key field', async () => {
+        const db = await createData();
+        await expect(db.employeeDeskSession.findMany({ where: { desk: { locationId: 'l1' } } })).resolves.toEqual([
+            expect.objectContaining({ id: 's1' }),
+        ]);
+    });
+
+    it('filters a to-one relation by a base-model scalar field', async () => {
+        const db = await createData();
+        await expect(
+            db.employeeDeskSession.findMany({ where: { desk: { name: { startsWith: 'desk1' } } } }),
+        ).resolves.toEqual([expect.objectContaining({ id: 's1' })]);
+    });
+
+    it('filters a to-one relation by a base-model relation', async () => {
+        const db = await createData();
+        await expect(
+            db.employeeDeskSession.findMany({ where: { desk: { location: { name: 'l2' } } } }),
+        ).resolves.toEqual([expect.objectContaining({ id: 's2' })]);
+    });
+
+    it('filters a to-many relation by a field inherited from the delegate base', async () => {
+        const db = await createTestClient(schema);
+
+        const l1 = await db.location.create({ data: { name: 'l1' } });
+        const l2 = await db.location.create({ data: { name: 'l2' } });
+
+        const desk1 = await db.resourceDesk.create({ data: { name: 'desk1', locationId: l1.id } });
+        await db.resourceDesk.create({ data: { name: 'desk2', locationId: l2.id } });
+
+        await db.employeeDeskSession.create({ data: { id: 's1', deskId: desk1.id } });
+
+        await expect(
+            db.location.findMany({ where: { resources: { some: { name: 'desk1' } } } }),
+        ).resolves.toEqual([expect.objectContaining({ id: l1.id })]);
+
+        await expect(
+            db.location.findMany({ where: { resources: { none: { name: 'desk1' } } } }),
+        ).resolves.toEqual([expect.objectContaining({ id: l2.id })]);
+    });
+});