diff --git a/lib/rack/cors.rb b/lib/rack/cors.rb
index 0a23106..131368a 100644
--- a/lib/rack/cors.rb
+++ b/lib/rack/cors.rb
@@ -278,8 +278,8 @@ def origins(*args, &blk)
             case n
             when Proc,
                  Regexp,
-                 /^https?:\/\//,
                  'file://'        then n
+            when  /^https?:\/\//  then URI.parse(n).to_s
             when '*'              then @public_resources = true; n
             else                  Regexp.compile("^[a-z][a-z0-9.+-]*:\\\/\\\/#{Regexp.quote(n)}$")
             end
diff --git a/test/unit/cors_test.rb b/test/unit/cors_test.rb
index f79c9fb..2e8987d 100644
--- a/test/unit/cors_test.rb
+++ b/test/unit/cors_test.rb
@@ -270,6 +270,13 @@ def load_app(name)
       cors_result.must_be :preflight
     end
 
+    it 'should allow HTTP/HTTPS origin without the default port' do
+      preflight_request('http://allow-the-default-port.io', '/')
+      last_response.must_render_cors_success
+      preflight_request('https://allow-the-default-port.io', '/')
+      last_response.must_render_cors_success
+    end
+
     it 'should allow any header if headers = :any' do
       preflight_request('http://localhost:3000', '/', :headers => 'Fooey')
       last_response.must_render_cors_success
diff --git a/test/unit/test.ru b/test/unit/test.ru
index 5793de1..55b9377 100644
--- a/test/unit/test.ru
+++ b/test/unit/test.ru
@@ -8,7 +8,9 @@ use Rack::Cors do
             '127.0.0.1:3000',
             /http:\/\/192\.168\.0\.\d{1,3}(:\d+)?/,
             'file://',
-            /http:\/\/(.*?)\.example\.com/
+            /http:\/\/(.*?)\.example\.com/,
+            'http://allow-the-default-port.io:80',
+            'https://allow-the-default-port.io:443'
 
     resource '/get-only', :methods => :get
     resource '/', :headers => :any, :methods => :any