diff --git a/src/dom/components/ReactDOMInput.js b/src/dom/components/ReactDOMInput.js
index b38b4d1172..fce25d7cdc 100644
--- a/src/dom/components/ReactDOMInput.js
+++ b/src/dom/components/ReactDOMInput.js
@@ -103,7 +103,9 @@ var ReactDOMInput = ReactCompositeComponent.createClass({
 
     var value = this.getValue();
     if (value != null) {
-      DOMPropertyOperations.setValueForProperty(rootNode, 'value', value);
+      // Cast `value` to a string to ensure the value is set correctly. While
+      // browsers typically do this as necessary, jsdom doesn't.
+      DOMPropertyOperations.setValueForProperty(rootNode, 'value', '' + value);
     }
   },
 
diff --git a/src/dom/components/ReactDOMTextarea.js b/src/dom/components/ReactDOMTextarea.js
index b53df29302..9da6fac114 100644
--- a/src/dom/components/ReactDOMTextarea.js
+++ b/src/dom/components/ReactDOMTextarea.js
@@ -113,7 +113,9 @@ var ReactDOMTextarea = ReactCompositeComponent.createClass({
   componentDidUpdate: function(prevProps, prevState, rootNode) {
     var value = this.getValue();
     if (value != null) {
-      DOMPropertyOperations.setValueForProperty(rootNode, 'value', value);
+      // Cast `value` to a string to ensure the value is set correctly. While
+      // browsers typically do this as necessary, jsdom doesn't.
+      DOMPropertyOperations.setValueForProperty(rootNode, 'value', '' + value);
     }
   },