diff --git a/rollup/rollup.base.js b/rollup/rollup.base.js
index 4e5f1b9..d99e999 100644
--- a/rollup/rollup.base.js
+++ b/rollup/rollup.base.js
@@ -9,10 +9,11 @@ export default {
         'react-dom',
         'react-is',
         'prop-types',
+        'classnames',
     ],
     plugins: () => ([// Must be a function so that plugin's instances are regenerated for every config
         resolve({extensions: ['.js', '.jsx']}),
         commonjs({include: /node_modules/}),
         babel({babelHelpers: 'runtime', exclude: /node_modules/}),
-    ])
+    ]),
 };
\ No newline at end of file
diff --git a/rollup/rollup.umd.js b/rollup/rollup.umd.js
index 653e84d..4344091 100644
--- a/rollup/rollup.umd.js
+++ b/rollup/rollup.umd.js
@@ -6,6 +6,7 @@ const globals = {
     'react': 'React',
     'react-dom': 'ReactDOM',
     'prop-types': 'PropTypes',
+    'classnames': 'classNames',
 };
 
 export const production = {