diff --git a/lib/builder/builder.js b/lib/builder/builder.js
index 1442466cb9..c2a300c585 100644
--- a/lib/builder/builder.js
+++ b/lib/builder/builder.js
@@ -446,9 +446,17 @@ export default class Builder {
 
     // Check plugins exist then set alias to their real path
     await Promise.all(this.plugins.map(async (p) => {
-      const pluginFile = `${p.src}${path.extname(p.src) ? '' : '.js'}`
-      if (!await fsExtra.pathExists(pluginFile)) {
-        throw new Error(`Plugin not found: ${pluginFile}`)
+      const ext = path.extname(p.src) ? '' : '.+([^.])'
+      const pluginFiles = await glob(`${p.src}${ext}`)
+
+      if (!pluginFiles || pluginFiles.length === 0) {
+        throw new Error(`Plugin not found: ${p.src}`)
+      } else if (pluginFiles.length > 1) {
+        consola.warn({
+          message: `Found ${pluginFiles.length} plugins that match the configuration, suggest to specify extension:`,
+          additional: `  ${pluginFiles.join('\n  ')}`,
+          badge: true
+        })
       }
 
       const src = this.relativeToBuild(p.src)
diff --git a/test/fixtures/with-config/plugins/test.json b/test/fixtures/with-config/plugins/test.json
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/test/fixtures/with-config/with-config.test.js b/test/fixtures/with-config/with-config.test.js
index 51962589d3..5edaa02493 100644
--- a/test/fixtures/with-config/with-config.test.js
+++ b/test/fixtures/with-config/with-config.test.js
@@ -1,3 +1,16 @@
+const consola = require('consola')
 const { buildFixture } = require('../../utils/build')
 
-buildFixture('with-config')
+describe('with-config', () => {
+  beforeAll(() => {
+    consola.warn = jest.fn()
+  })
+  buildFixture('with-config', () => {
+    expect(consola.warn).toHaveBeenCalledTimes(1)
+    expect(consola.warn.mock.calls[0]).toMatchObject([{
+      message: 'Found 2 plugins that match the configuration, suggest to specify extension:',
+      additional: expect.stringContaining('plugins/test.json'),
+      badge: true
+    }])
+  })
+})
diff --git a/test/utils/build.js b/test/utils/build.js
index 52317fa65d..d03ddc7279 100644
--- a/test/utils/build.js
+++ b/test/utils/build.js
@@ -1,6 +1,6 @@
 import { loadFixture, Nuxt, Builder } from './index'
 
-export const buildFixture = function buildFixture(fixture) {
+export const buildFixture = function (fixture, callback) {
   test(`Build ${fixture}`, async () => {
     const config = loadFixture(fixture)
     const nuxt = new Nuxt(config)
@@ -10,5 +10,8 @@ export const buildFixture = function buildFixture(fixture) {
     // 2: BUILD_DONE
     expect(builder._buildStatus).toBe(2)
     expect(buildDone).toHaveBeenCalledTimes(1)
+    if (typeof callback === 'function') {
+      callback(builder)
+    }
   }, 120000)
 }