diff --git a/plugins/node/opentelemetry-instrumentation-express/test/custom-config.test.ts b/plugins/node/opentelemetry-instrumentation-express/test/custom-config.test.ts
index d6b418c60c..ffc02a53db 100644
--- a/plugins/node/opentelemetry-instrumentation-express/test/custom-config.test.ts
+++ b/plugins/node/opentelemetry-instrumentation-express/test/custom-config.test.ts
@@ -26,8 +26,9 @@ import * as assert from 'assert';
 import { RPCMetadata, RPCType, setRPCMetadata } from '@opentelemetry/core';
 import { ExpressLayerType } from '../src/enums/ExpressLayerType';
 import { AttributeNames } from '../src/enums/AttributeNames';
-import { ExpressInstrumentation, ExpressInstrumentationConfig } from '../src';
-import { createServer, httpRequest } from './utils';
+import { ExpressInstrumentation } from '../src/instrumentation.js';
+import { ExpressInstrumentationConfig } from '../src/types.js';
+import { createServer, httpRequest } from './utils.js';
 
 const instrumentation = new ExpressInstrumentation({
   ignoreLayersType: [ExpressLayerType.MIDDLEWARE],
diff --git a/plugins/node/opentelemetry-instrumentation-express/test/express.test.ts b/plugins/node/opentelemetry-instrumentation-express/test/express.test.ts
index 80c0251815..092e91c991 100644
--- a/plugins/node/opentelemetry-instrumentation-express/test/express.test.ts
+++ b/plugins/node/opentelemetry-instrumentation-express/test/express.test.ts
@@ -23,8 +23,8 @@ import {
 } from '@opentelemetry/sdk-trace-base';
 import * as assert from 'assert';
 import { AttributeNames } from '../src/enums/AttributeNames';
-import { ExpressInstrumentation } from '../src';
-import { createServer, httpRequest, serverWithMiddleware } from './utils';
+import { ExpressInstrumentation } from '../src/instrumentation.js';
+import { createServer, httpRequest, serverWithMiddleware } from './utils.js';
 import { SemanticAttributes } from '@opentelemetry/semantic-conventions';
 
 const instrumentation = new ExpressInstrumentation();
diff --git a/plugins/node/opentelemetry-instrumentation-express/test/hooks.test.ts b/plugins/node/opentelemetry-instrumentation-express/test/hooks.test.ts
index 90d98a356c..8fb6f5dcc5 100644
--- a/plugins/node/opentelemetry-instrumentation-express/test/hooks.test.ts
+++ b/plugins/node/opentelemetry-instrumentation-express/test/hooks.test.ts
@@ -24,9 +24,9 @@ import {
 import * as assert from 'assert';
 import type * as http from 'http';
 import * as sinon from 'sinon';
-import { ExpressInstrumentation } from '../src';
-import { ExpressRequestInfo, SpanNameHook } from '../src/types';
-import { ExpressLayerType } from '../src/enums/ExpressLayerType';
+import { ExpressInstrumentation } from '../src/instrumentation.js';
+import { ExpressRequestInfo, SpanNameHook } from '../src/types.js';
+import { ExpressLayerType } from '../src/enums/ExpressLayerType.js';
 import { SemanticAttributes } from '@opentelemetry/semantic-conventions';
 
 const instrumentation = new ExpressInstrumentation();
diff --git a/plugins/node/opentelemetry-instrumentation-express/test/ignore-all.test.ts b/plugins/node/opentelemetry-instrumentation-express/test/ignore-all.test.ts
index 0fdebeabfb..ac66747ba0 100644
--- a/plugins/node/opentelemetry-instrumentation-express/test/ignore-all.test.ts
+++ b/plugins/node/opentelemetry-instrumentation-express/test/ignore-all.test.ts
@@ -23,9 +23,10 @@ import {
 } from '@opentelemetry/sdk-trace-base';
 import * as assert from 'assert';
 import { RPCMetadata, RPCType, setRPCMetadata } from '@opentelemetry/core';
-import { AttributeNames } from '../src/enums/AttributeNames';
-import { ExpressInstrumentation, ExpressLayerType } from '../src';
-import { createServer, httpRequest } from './utils';
+import { AttributeNames } from '../src/enums/AttributeNames.js';
+import { ExpressInstrumentation } from '../src/instrumentation.js';
+import { ExpressLayerType } from '../src/enums/ExpressLayerType.js';
+import { createServer, httpRequest } from './utils.js';
 
 const instrumentation = new ExpressInstrumentation({
   ignoreLayersType: [
diff --git a/plugins/node/opentelemetry-instrumentation-express/test/utils.test.ts b/plugins/node/opentelemetry-instrumentation-express/test/utils.test.ts
index fc927a9b7f..760feaa536 100644
--- a/plugins/node/opentelemetry-instrumentation-express/test/utils.test.ts
+++ b/plugins/node/opentelemetry-instrumentation-express/test/utils.test.ts
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-import * as utils from '../src/utils';
+import * as utils from '../src/utils.js';
 import * as assert from 'assert';
-import { ExpressInstrumentationConfig } from '../src/types';
-import { ExpressLayer } from '../src/internal-types';
-import { ExpressLayerType } from '../src/enums/ExpressLayerType';
-import { AttributeNames } from '../src/enums/AttributeNames';
+import { ExpressInstrumentationConfig } from '../src/types.js';
+import { ExpressLayer } from '../src/internal-types.js';
+import { ExpressLayerType } from '../src/enums/ExpressLayerType.js';
+import { AttributeNames } from '../src/enums/AttributeNames.js';
 
 describe('Utils', () => {
   describe('isLayerIgnored()', () => {