diff --git a/e2e/custom-resolver/resolver.js b/e2e/custom-resolver/resolver.js
index 7385bfdd28c4..e9a718b139b5 100644
--- a/e2e/custom-resolver/resolver.js
+++ b/e2e/custom-resolver/resolver.js
@@ -2,7 +2,7 @@
 
 const {
   default: defaultResolver,
-} = require('jest-resolve/build/default_resolver');
+} = require('jest-resolve/build/defaultResolver');
 
 const exportedModules = new Map([
   ['foo', 'foo'],
diff --git a/packages/jest-resolve/src/__tests__/is_builtin_module.test.js b/packages/jest-resolve/src/__tests__/isBuiltinModule.test.js
similarity index 92%
rename from packages/jest-resolve/src/__tests__/is_builtin_module.test.js
rename to packages/jest-resolve/src/__tests__/isBuiltinModule.test.js
index 7be6a38dcae6..a18f8b4a0b0d 100644
--- a/packages/jest-resolve/src/__tests__/is_builtin_module.test.js
+++ b/packages/jest-resolve/src/__tests__/isBuiltinModule.test.js
@@ -1,7 +1,7 @@
 // Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
 // @flow
 
-import isBuiltinModule from '../is_builtin_module';
+import isBuiltinModule from '../isBuiltinModule';
 
 describe('isBuiltinModule', () => {
   it('should return true for the `path` module', () => {
diff --git a/packages/jest-resolve/src/__tests__/resolve.test.js b/packages/jest-resolve/src/__tests__/resolve.test.js
index 7d17eebac935..f4c75c4e6927 100644
--- a/packages/jest-resolve/src/__tests__/resolve.test.js
+++ b/packages/jest-resolve/src/__tests__/resolve.test.js
@@ -15,7 +15,7 @@ const path = require('path');
 const ModuleMap = require('jest-haste-map').ModuleMap;
 const Resolver = require('../');
 const userResolver = require('../__mocks__/userResolver');
-const nodeModulesPaths = require('../node_modules_paths').default;
+const nodeModulesPaths = require('../nodeModulesPaths').default;
 
 beforeEach(() => {
   userResolver.mockClear();
diff --git a/packages/jest-resolve/src/default_resolver.js b/packages/jest-resolve/src/defaultResolver.js
similarity index 97%
rename from packages/jest-resolve/src/default_resolver.js
rename to packages/jest-resolve/src/defaultResolver.js
index ae85c4e888d8..02f311c22ece 100644
--- a/packages/jest-resolve/src/default_resolver.js
+++ b/packages/jest-resolve/src/defaultResolver.js
@@ -13,8 +13,8 @@ import type {ErrorWithCode} from 'types/Errors';
 import browserResolve from 'browser-resolve';
 import fs from 'fs';
 import path from 'path';
-import isBuiltinModule from './is_builtin_module';
-import nodeModulesPaths from './node_modules_paths';
+import isBuiltinModule from './isBuiltinModule';
+import nodeModulesPaths from './nodeModulesPaths';
 
 type ResolverOptions = {|
   basedir: Path,
diff --git a/packages/jest-resolve/src/index.js b/packages/jest-resolve/src/index.js
index 4d3c042d7117..7ad9ea1e960d 100644
--- a/packages/jest-resolve/src/index.js
+++ b/packages/jest-resolve/src/index.js
@@ -14,9 +14,9 @@ import type {ErrorWithCode} from 'types/Errors';
 
 import fs from 'fs';
 import path from 'path';
-import nodeModulesPaths from './node_modules_paths';
-import isBuiltinModule from './is_builtin_module';
-import defaultResolver from './default_resolver.js';
+import nodeModulesPaths from './nodeModulesPaths';
+import isBuiltinModule from './isBuiltinModule';
+import defaultResolver from './defaultResolver';
 import chalk from 'chalk';
 
 type ResolverConfig = {|
diff --git a/packages/jest-resolve/src/is_builtin_module.js b/packages/jest-resolve/src/isBuiltinModule.js
similarity index 100%
rename from packages/jest-resolve/src/is_builtin_module.js
rename to packages/jest-resolve/src/isBuiltinModule.js
diff --git a/packages/jest-resolve/src/node_modules_paths.js b/packages/jest-resolve/src/nodeModulesPaths.js
similarity index 100%
rename from packages/jest-resolve/src/node_modules_paths.js
rename to packages/jest-resolve/src/nodeModulesPaths.js
diff --git a/packages/jest-runtime/src/__tests__/defaultResolver.js b/packages/jest-runtime/src/__tests__/defaultResolver.js
index 089aa58e6055..adb6f54aa902 100644
--- a/packages/jest-runtime/src/__tests__/defaultResolver.js
+++ b/packages/jest-runtime/src/__tests__/defaultResolver.js
@@ -6,5 +6,5 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  *
  */
-import resolver from 'jest-resolve/build/default_resolver.js';
+import resolver from 'jest-resolve/build/defaultResolver.js';
 module.exports = resolver;