diff --git a/src/components/mdRadio/mdRadio.vue b/src/components/mdRadio/mdRadio.vue
index 6f8e8ec..ae1c142 100644
--- a/src/components/mdRadio/mdRadio.vue
+++ b/src/components/mdRadio/mdRadio.vue
@@ -31,7 +31,7 @@
     computed: {
       classes() {
         return {
-          'md-checked': this.value && this.mdValue.toString() === this.value.toString(),
+          'md-checked': typeof this.value !== 'undefined' && this.mdValue.toString() === this.value.toString(),
           'md-disabled': this.disabled
         };
       }