diff --git a/.changeset/tough-horses-return.md b/.changeset/tough-horses-return.md
new file mode 100644
index 0000000000..425c668a74
--- /dev/null
+++ b/.changeset/tough-horses-return.md
@@ -0,0 +1,6 @@
+---
+"@medusajs/test-utils": patch
+"@medusajs/index": patch
+---
+
+fix(index): merge filterable fields with default fields
diff --git a/integration-tests/modules/__tests__/index/query-index.spec.ts b/integration-tests/modules/__tests__/index/query-index.spec.ts
index 32335f429f..a55d9db35d 100644
--- a/integration-tests/modules/__tests__/index/query-index.spec.ts
+++ b/integration-tests/modules/__tests__/index/query-index.spec.ts
@@ -1,6 +1,12 @@
+import CustomerModule from "@medusajs/customer"
+import ProductModule from "@medusajs/product"
 import { medusaIntegrationTestRunner } from "@medusajs/test-utils"
 import { RemoteQueryFunction } from "@medusajs/types"
-import { ContainerRegistrationKeys, defaultCurrencies } from "@medusajs/utils"
+import {
+  ContainerRegistrationKeys,
+  defaultCurrencies,
+  defineLink,
+} from "@medusajs/utils"
 import { setTimeout } from "timers/promises"
 import {
   adminHeaders,
@@ -26,6 +32,7 @@ async function populateData(api: any) {
       title: "Test Product",
       status: "published",
       description: "test-product-description",
+      origin_country: "USA",
       shipping_profile_id: shippingProfile.id,
       options: [{ title: "Denominations", values: ["100"] }],
       variants: [
@@ -82,6 +89,17 @@ async function populateData(api: any) {
 process.env.ENABLE_INDEX_MODULE = "true"
 
 medusaIntegrationTestRunner({
+  hooks: {
+    beforeServerStart: async () => {
+      const customer = CustomerModule.linkable.customer
+      const product = ProductModule.linkable.product
+
+      defineLink(customer, {
+        linkable: product,
+        filterable: ["origin_country"],
+      })
+    },
+  },
   testSuite: ({ getContainer, dbConnection, api, dbConfig }) => {
     let appContainer
 
@@ -417,6 +435,33 @@ medusaIntegrationTestRunner({
 
         expect(resultset.data.length).toEqual(2)
       })
+
+      it("should query by custom linkable field and default field using query.index", async () => {
+        await populateData(api)
+
+        const query = appContainer.resolve(
+          ContainerRegistrationKeys.QUERY
+        ) as RemoteQueryFunction
+
+        const resultset = await fetchAndRetry(
+          async () =>
+            await query.index({
+              entity: "product",
+              fields: ["id", "origin_country"],
+              filters: {
+                origin_country: ["USA"],
+              },
+            }),
+          ({ data }) => data.length > 0,
+          {
+            retries: 3,
+            waitSeconds: 3,
+          }
+        )
+
+        expect(resultset.data.length).toEqual(1)
+        expect(resultset.data[0].origin_country).toEqual("USA")
+      })
     })
   },
 })
diff --git a/packages/medusa-test-utils/src/medusa-test-runner.ts b/packages/medusa-test-utils/src/medusa-test-runner.ts
index abfd6cbc04..cc66edcca9 100644
--- a/packages/medusa-test-utils/src/medusa-test-runner.ts
+++ b/packages/medusa-test-utils/src/medusa-test-runner.ts
@@ -1,3 +1,4 @@
+import { logger } from "@medusajs/framework/logger"
 import { MedusaAppOutput } from "@medusajs/framework/modules-sdk"
 import { MedusaContainer } from "@medusajs/framework/types"
 import {
@@ -7,7 +8,6 @@ import {
   mergePluginModules,
 } from "@medusajs/framework/utils"
 import { asValue } from "awilix"
-import { logger } from "@medusajs/framework/logger"
 import { dbTestUtilFactory, getDatabaseURL } from "./database"
 import {
   applyEnvVarsToProcess,
@@ -48,6 +48,9 @@ interface TestRunnerConfig {
   schema?: string
   debug?: boolean
   inApp?: boolean
+  hooks?: {
+    beforeServerStart?: (container: MedusaContainer) => Promise<void>
+  }
 }
 
 class MedusaTestRunner {
@@ -72,6 +75,7 @@ class MedusaTestRunner {
   private loadedApplication: any = null
   private shutdown: () => Promise<void> = async () => void 0
   private isFirstTime = true
+  private hooks: TestRunnerConfig["hooks"] = {}
 
   constructor(config: TestRunnerConfig) {
     const tempName = parseInt(process.env.JEST_WORKER_ID || "1")
@@ -93,6 +97,7 @@ class MedusaTestRunner {
       schema: this.schema,
       debug: this.debug,
     }
+    this.hooks = config.hooks ?? {}
 
     this.setupProcessHandlers()
   }
@@ -158,6 +163,10 @@ class MedusaTestRunner {
       [ContainerRegistrationKeys.LOGGER]: asValue(logger),
     })
 
+    if (this.hooks?.beforeServerStart) {
+      await this.hooks.beforeServerStart(container)
+    }
+
     await this.initializeDatabase()
 
     logger.info(
@@ -309,6 +318,7 @@ export function medusaIntegrationTestRunner({
   debug = false,
   inApp = false,
   testSuite,
+  hooks,
 }: {
   moduleName?: string
   env?: Record<string, any>
@@ -318,6 +328,7 @@ export function medusaIntegrationTestRunner({
   debug?: boolean
   inApp?: boolean
   testSuite: (options: MedusaSuiteOptions) => void
+  hooks?: TestRunnerConfig["hooks"]
 }) {
   const runner = new MedusaTestRunner({
     moduleName,
@@ -327,6 +338,7 @@ export function medusaIntegrationTestRunner({
     env,
     debug,
     inApp,
+    hooks,
   })
 
   return describe("", () => {
diff --git a/packages/modules/index/src/utils/build-config.ts b/packages/modules/index/src/utils/build-config.ts
index dd924210bd..a761177406 100644
--- a/packages/modules/index/src/utils/build-config.ts
+++ b/packages/modules/index/src/utils/build-config.ts
@@ -1206,7 +1206,7 @@ function buildSchemaFromFilterableLinks(
         })
         .join("\n")
 
-      return `type ${entity} ${events} {
+      return `extend type ${entity} ${events} {
 ${fieldDefinitions}
 }`
     })