diff --git a/packages/runtime/src/enhancements/delegate.ts b/packages/runtime/src/enhancements/delegate.ts
index edbaed78d..ea31fe02d 100644
--- a/packages/runtime/src/enhancements/delegate.ts
+++ b/packages/runtime/src/enhancements/delegate.ts
@@ -460,8 +460,8 @@ export class DelegateProxyHandler extends DefaultPrismaProxyHandler {
     }
 
     // ensure the full nested "create" structure is created for base types
-    private ensureBaseCreateHierarchy(model: string, result: any) {
-        let curr = result;
+    private ensureBaseCreateHierarchy(model: string, args: any) {
+        let curr = args;
         let base = this.getBaseModel(model);
         let sub = this.getModelInfo(model);
 
@@ -478,6 +478,16 @@ export class DelegateProxyHandler extends DefaultPrismaProxyHandler {
                     curr[baseRelationName].create[base.discriminator] = sub.name;
                 }
             }
+
+            // Look for base id field assignments in the current level, and push
+            // them down to the base level
+            for (const idField of getIdFields(this.options.modelMeta, base.name)) {
+                if (curr[idField.name] !== undefined) {
+                    curr[baseRelationName].create[idField.name] = curr[idField.name];
+                    delete curr[idField.name];
+                }
+            }
+
             curr = curr[baseRelationName].create;
             sub = base;
             base = this.getBaseModel(base.name);
diff --git a/tests/integration/tests/enhancements/with-delegate/enhanced-client.test.ts b/tests/integration/tests/enhancements/with-delegate/enhanced-client.test.ts
index 8acc832c6..ea9b8efca 100644
--- a/tests/integration/tests/enhancements/with-delegate/enhanced-client.test.ts
+++ b/tests/integration/tests/enhancements/with-delegate/enhanced-client.test.ts
@@ -158,6 +158,22 @@ describe('Polymorphism Test', () => {
         ).resolves.toMatchObject({ count: 2 });
     });
 
+    it('create concrete with explicit id', async () => {
+        const { enhance } = await loadSchema(schema, { enhancements: ['delegate'] });
+        const db = enhance();
+
+        await expect(
+            db.ratedVideo.create({ data: { id: 1, duration: 100, url: 'xyz', rating: 5 } })
+        ).resolves.toMatchObject({
+            id: 1,
+            duration: 100,
+            url: 'xyz',
+            rating: 5,
+            assetType: 'Video',
+            videoType: 'RatedVideo',
+        });
+    });
+
     it('read with concrete', async () => {
         const { db, user, video } = await setup();
 
diff --git a/tests/regression/tests/issue-1518.test.ts b/tests/regression/tests/issue-1518.test.ts
new file mode 100644
index 000000000..83517a5ca
--- /dev/null
+++ b/tests/regression/tests/issue-1518.test.ts
@@ -0,0 +1,31 @@
+import { loadSchema } from '@zenstackhq/testtools';
+describe('issue 1518', () => {
+    it('regression', async () => {
+        const { enhance } = await loadSchema(
+            `
+            model Activity {
+                id        String       @id @default(uuid())
+                title     String
+                type      String
+                @@delegate(type)
+                @@allow('all', true)
+            }
+
+            model TaskActivity extends Activity {
+                description String
+                @@map("task_activity")
+                @@allow('all', true)
+            }
+            `
+        );
+
+        const db = enhance();
+        await db.taskActivity.create({
+            data: {
+                id: '00000000-0000-0000-0000-111111111111',
+                title: 'Test Activity',
+                description: 'Description of task',
+            },
+        });
+    });
+});