diff --git a/src/config.js b/src/config.js
index 565c682ea3..c27bb46b27 100644
--- a/src/config.js
+++ b/src/config.js
@@ -1,6 +1,8 @@
 import * as Platform from './platform';
 import * as util from './util';
 
+// TODO stop hardcoding platforms and media sizes
+
 /*
  config
    .set({ side: 'left' })
@@ -83,6 +85,7 @@ class ConfigCase {
   }
   unset(key) {
     delete this._values[key];
+    return this;
   }
   get(key) {
     return util.isDefined(this._values[key]) ? 
diff --git a/src/config_spec.js b/src/config_spec.js
index 6a7c3baf20..59c6f000c6 100644
--- a/src/config_spec.js
+++ b/src/config_spec.js
@@ -75,7 +75,7 @@ export function main() {
     var sub1 = rootConfig.platform('ios');
     sub1.set({ letter: 'b' });
     expect(sub1.get('letter')).toBe('b');
-    sub1.unset('letter');
+    expect( sub1.unset('letter') ).toBe(sub1);
     expect(sub1.get('letter')).toBe('a');
   });