diff --git a/app/views/api/playground.html.erb b/app/views/api/playground.html.erb
index 3941402..9edbea7 100644
--- a/app/views/api/playground.html.erb
+++ b/app/views/api/playground.html.erb
@@ -1,6 +1,8 @@
 <h1>API Playground</h1>
 
 <script>
+<% prefix = Noosfero::API::API.prefix %>
+var prefix = <%= prefix.to_json %>;
 var endpoints = <%=
 endpoints.map do |endpoint|
   app = endpoint.options[:app].to_s
@@ -13,8 +15,8 @@ endpoints.map do |endpoint|
     end
   end
 end.flatten.compact.sort{|a,b|
-  a[:path]=='/api/v1/login' ? -1 :
-  b[:path]=='/api/v1/login' ?  1 :
+  a[:path]=="#{prefix}/v1/login" ? -1 :
+  b[:path]=="#{prefix}/v1/login" ?  1 :
   a[:path] <=> b[:path]
 }.to_json %>;
 </script>
@@ -33,4 +35,4 @@ end.flatten.compact.sort{|a,b|
 </div>
 <pre id="api-response" class="empty"></pre>
 
-<script src="/javascripts/api-playground.js"></script>
+<%= javascript_include_tag 'api-playground' %>
diff --git a/lib/noosfero/api/api.rb b/lib/noosfero/api/api.rb
index 477ccc9..39fba05 100644
--- a/lib/noosfero/api/api.rb
+++ b/lib/noosfero/api/api.rb
@@ -32,7 +32,7 @@ module Noosfero
       after { set_session_cookie }
 
       version 'v1'
-      prefix "api"
+      prefix [ENV['RAILS_RELATIVE_URL_ROOT'], "api"].compact.join('/')
       format :json
       content_type :txt, "text/plain"
 
diff --git a/public/javascripts/api-playground.js b/public/javascripts/api-playground.js
index 1199237..ddffd7d 100644
--- a/public/javascripts/api-playground.js
+++ b/public/javascripts/api-playground.js
@@ -24,7 +24,7 @@ var playground = {
   selEndpoint: function() {
     var endpoint = this.getEndpoint();
     jQuery('#api-form .api-param').remove();
-    if ( endpoint.path == '/api/v1/login' ) {
+    if ( endpoint.path == prefix+'/v1/login' ) {
       this.addFormParam('login');
       this.addFormParam('password');
     }
@@ -51,7 +51,7 @@ var playground = {
     for (var i=1; i<rawData.length; i+=2) {
       data[ rawData[i].value ] = rawData[i+1].value;
     }
-    if ( endpoint.path != '/api/v1/login' ) {
+    if ( endpoint.path != prefix+'/v1/login' ) {
       data.private_token = this.getToken();
     }
     jQuery('#api-response').empty()[0].className = 'empty';
@@ -71,7 +71,7 @@ var playground = {
         jQuery('#api-response').text(
           JSON.stringify(data, null, '  ')
         )[0].className = 'full';
-        if ( endpoint.path == '/api/v1/login' ) {
+        if ( endpoint.path == prefix+'/v1/login' ) {
           playground.setToken(data.private_token)
         }
       },
--
libgit2 0.21.2