diff --git a/src/core/importType.js b/src/core/importType.js
index 23bc6350d..c196ecd39 100644
--- a/src/core/importType.js
+++ b/src/core/importType.js
@@ -13,8 +13,9 @@ export function isAbsolute(name) {
 }
 
 export function isBuiltIn(name, settings) {
+  const baseModule = name.split('/')[0]
   const extras = (settings && settings['import/core-modules']) || []
-  return builtinModules.indexOf(name) !== -1 || extras.indexOf(name) > -1
+  return builtinModules.indexOf(baseModule) !== -1 || extras.indexOf(baseModule) > -1
 }
 
 function isExternalPath(path, name, settings) {
diff --git a/tests/src/core/importType.js b/tests/src/core/importType.js
index 5b63910af..e5e6f85ea 100644
--- a/tests/src/core/importType.js
+++ b/tests/src/core/importType.js
@@ -5,7 +5,7 @@ import importType from 'core/importType'
 
 import { testContext } from '../utils'
 
-describe('importType(name)', function () {
+describe.only('importType(name)', function () {
   const context = testContext()
 
   it("should return 'absolute' for paths starting with a /", function() {
@@ -74,6 +74,11 @@ describe('importType(name)', function () {
     expect(importType('electron', electronContext)).to.equal('builtin')
   })
 
+  it("should return 'builtin' for resources inside additional core modules", function() {
+    const electronContext = testContext({ 'import/core-modules': ['electron'] })
+    expect(importType('electron/some/path/to/resource.json', electronContext)).to.equal('builtin')
+  })
+
   it("should return 'external' for module from 'node_modules' with default config", function() {
     expect(importType('builtin-modules', context)).to.equal('external')
   })