diff --git a/packages/schema/src/plugins/enhancer/enhance/index.ts b/packages/schema/src/plugins/enhancer/enhance/index.ts
index cef6efced..0da689e49 100644
--- a/packages/schema/src/plugins/enhancer/enhance/index.ts
+++ b/packages/schema/src/plugins/enhancer/enhance/index.ts
@@ -147,12 +147,7 @@ export function enhance<DbClient extends object>(prisma: DbClient, context?: Enh
 
     private createLogicalPrismaImports(prismaImport: string, logicalPrismaClientDir: string) {
         return `import { Prisma as _Prisma, PrismaClient as _PrismaClient } from '${prismaImport}';
-import type {
-    InternalArgs,
-    TypeMapDef,
-    TypeMapCbDef,
-    DynamicClientExtensionThis,
-} from '${prismaImport}/runtime/library';
+import type { InternalArgs, DynamicClientExtensionThis } from '${prismaImport}/runtime/library';
 import type * as _P from '${logicalPrismaClientDir}/index-fixed';
 import type { Prisma, PrismaClient } from '${logicalPrismaClientDir}/index-fixed';
 `;
@@ -173,11 +168,11 @@ export function enhance<ExtArgs extends Record<string, any> & InternalArgs>(
         };
     
 // overload for extended PrismaClient
-export function enhance<TypeMap extends TypeMapDef, TypeMapCb extends TypeMapCbDef, ExtArgs extends Record<string, any> & InternalArgs${
-            hasClientOptions ? ', ClientOptions' : ''
-        }>(
-    prisma: DynamicClientExtensionThis<TypeMap, TypeMapCb, ExtArgs${hasClientOptions ? ', ClientOptions' : ''}>,
-    context?: EnhancementContext<${authTypeParam}>, options?: EnhancementOptions): DynamicClientExtensionThis<Prisma.TypeMap, Prisma.TypeMapCb, ExtArgs${
+export function enhance<ExtArgs extends Record<string, any> & InternalArgs${hasClientOptions ? ', ClientOptions' : ''}>(
+    prisma: DynamicClientExtensionThis<_Prisma.TypeMap<ExtArgs>, _Prisma.TypeMapCb, ExtArgs${
+        hasClientOptions ? ', ClientOptions' : ''
+    }>,
+    context?: EnhancementContext<${authTypeParam}>, options?: EnhancementOptions): DynamicClientExtensionThis<Prisma.TypeMap<ExtArgs>, Prisma.TypeMapCb, ExtArgs${
             hasClientOptions ? ', ClientOptions' : ''
         }>${this.generatePermissionChecker ? ' & ModelCheckers' : ''};
 
diff --git a/tests/regression/tests/issue-1493.test.ts b/tests/regression/tests/issue-1493.test.ts
new file mode 100644
index 000000000..aa1bbb3af
--- /dev/null
+++ b/tests/regression/tests/issue-1493.test.ts
@@ -0,0 +1,66 @@
+import { loadSchema } from '@zenstackhq/testtools';
+describe('issue 1493', () => {
+    it('regression', async () => {
+        await loadSchema(
+            `
+            datasource db {
+                provider = 'sqlite'
+                url = 'file:./dev.db'
+            }
+
+            generator js {
+                provider = 'prisma-client-js'
+            }
+
+            plugin enhancer {
+                provider = '@core/enhancer'
+                output = './zenstack'
+            }
+            
+            model User {
+                id Int @id
+                email String
+                posts Post[]
+            }
+
+            model Post {
+                id Int @id
+                title String
+                content String
+                author User @relation(fields: [authorId], references: [id])
+                authorId Int @default(auth().id)
+            }
+            `,
+            {
+                addPrelude: false,
+                compile: true,
+                getPrismaOnly: true,
+                extraSourceFiles: [
+                    {
+                        name: 'main.ts',
+                        content: `
+            import { PrismaClient } from '@prisma/client';
+            import { enhance } from './zenstack/enhance';
+            const prisma = new PrismaClient().$extends({
+                result: {
+                    user: {
+                        gravatarUrl: {
+                            needs: { email: true },
+                            compute(user) {
+                                return user.email + 'hash';
+                            },
+                        },
+                    },
+                },
+            });
+
+            prisma.user.findFirst().then((user) => user?.gravatarUrl);
+            const db = enhance(prisma, undefined, { kinds: [] });
+            db.user.findFirst().then((user) => user?.gravatarUrl);
+                        `,
+                    },
+                ],
+            }
+        );
+    });
+});