diff --git a/lib/environment/PathnameEnvironment.js b/lib/environment/PathnameEnvironment.js
index 840eaa1..669b87c 100644
--- a/lib/environment/PathnameEnvironment.js
+++ b/lib/environment/PathnameEnvironment.js
@@ -7,6 +7,9 @@ var Environment = require('./Environment');
  */
 function PathnameEnvironment() {
   this.onPopState = this.onPopState.bind(this);
+  this.useHistoryApi = !!(window.history &&
+                          window.history.pushState &&
+                          window.history.replaceState);
   Environment.call(this);
 }
 
@@ -18,21 +21,29 @@ PathnameEnvironment.prototype.getPath = function() {
 }
 
 PathnameEnvironment.prototype.pushState = function(path, navigation) {
-  window.history.pushState({}, '', path);
+  if (this.useHistoryApi) {
+    window.history.pushState({}, '', path);
+  } else {
+    window.location.pathname = path;
+  }
 }
 
 PathnameEnvironment.prototype.replaceState = function(path, navigation) {
-  window.history.replaceState({}, '', path);
+  if (this.useHistoryApi) {
+    window.history.replaceState({}, '', path);
+  } else {
+    window.location.pathname = path;
+  }
 }
 
 PathnameEnvironment.prototype.start = function() {
-  if (window.addEventListener) {
+  if (this.useHistoryApi && window.addEventListener) {
     window.addEventListener('popstate', this.onPopState);
   }
 };
 
 PathnameEnvironment.prototype.stop = function() {
-  if (window.removeEventListener) {
+  if (this.useHistoryApi && window.removeEventListener) {
     window.removeEventListener('popstate', this.onPopState);
   }
 };