diff --git a/src/text-field.jsx b/src/text-field.jsx
index 397d2a4259c94f..8be6b8bfada799 100644
--- a/src/text-field.jsx
+++ b/src/text-field.jsx
@@ -16,7 +16,7 @@ const ContextPure = require('./mixins/context-pure');
  * @returns True if the string provided is valid, false otherwise.
  */
 function isValid(value) {
-  return value || value === 0;
+  return Boolean(value || value === 0);
 }
 
 const TextField = React.createClass({