diff --git a/packages/npm-package-json-lint-config/test/index.test.js b/packages/npm-package-json-lint-config/test/index.test.js
index 178b19392c092..f226faa0623ba 100644
--- a/packages/npm-package-json-lint-config/test/index.test.js
+++ b/packages/npm-package-json-lint-config/test/index.test.js
@@ -1,8 +1,3 @@
-/**
- * External dependencies
- */
-import { isPlainObject } from 'is-plain-object';
-
 /**
  * Internal dependencies
  */
@@ -10,10 +5,12 @@ import config from '../';
 
 describe( 'npm-package-json-lint config tests', () => {
 	it( 'should be an object', () => {
-		expect( isPlainObject( config ) ).toBeTruthy();
+		expect( config ).not.toBeNull();
+		expect( typeof config ).toBe( 'object' );
 	} );
 
 	it( 'should have rules property as an object', () => {
-		expect( isPlainObject( config.rules ) ).toBeTruthy();
+		expect( config.rules ).not.toBeNull();
+		expect( typeof config.rules ).toBe( 'object' );
 	} );
 } );