diff --git a/oa-core/lib/omniauth/strategy.rb b/oa-core/lib/omniauth/strategy.rb
index 11ce8e01f..3fea37f6b 100644
--- a/oa-core/lib/omniauth/strategy.rb
+++ b/oa-core/lib/omniauth/strategy.rb
@@ -82,7 +82,7 @@ def full_host
     end
     
     def callback_url
-      full_host + "#{OmniAuth.config.path_prefix}/#{name}/callback"
+      full_host + callback_path
     end
     
     def session
@@ -106,4 +106,4 @@ def fail!(message_key, exception = nil)
       OmniAuth.config.on_failure.call(self.env, message_key.to_sym)
     end
   end
-end
\ No newline at end of file
+end
diff --git a/oa-core/spec/omniauth/strategy_spec.rb b/oa-core/spec/omniauth/strategy_spec.rb
index 17e988241..d41552785 100644
--- a/oa-core/spec/omniauth/strategy_spec.rb
+++ b/oa-core/spec/omniauth/strategy_spec.rb
@@ -38,6 +38,16 @@ def callback_phase
       it 'should use the default callback path' do
         lambda{ strategy.call({'PATH_INFO' => '/auth/test/callback'}) }.should raise_error("Callback Phase")
       end
+
+      context 'callback_url' do
+        it 'uses the default callback_path' do
+          strategy.should_receive(:full_host).and_return('http://example.com')
+
+          lambda{ strategy.call({'PATH_INFO' => '/auth/test'}) }.should raise_error("Request Phase")
+
+          strategy.callback_url.should == 'http://example.com/auth/test/callback'
+        end
+      end
     end
     
     it 'should be able to modify the env on the fly before the request_phase' do
@@ -59,6 +69,17 @@ def callback_phase
         @options = {:callback_path => '/radical'}
         lambda{ strategy.call({'PATH_INFO' => '/radical'}) }.should raise_error("Callback Phase")
       end
+
+      context 'callback_url' do
+        it 'uses a custom callback_path if one is provided' do
+          @options = {:callback_path => '/radical'}
+          strategy.should_receive(:full_host).and_return('http://example.com')
+
+          lambda{ strategy.call({'PATH_INFO' => '/radical'}) }.should raise_error("Callback Phase")
+
+          strategy.callback_url.should == 'http://example.com/radical'
+        end
+      end
     end
     
     context 'custom prefix' do
@@ -73,6 +94,16 @@ def callback_phase
       it 'should use a custom prefix for callback' do
         lambda{ strategy.call({'PATH_INFO' => '/wowzers/test/callback'}) }.should raise_error("Callback Phase")
       end
+
+      context 'callback_url' do
+        it 'uses a custom prefix' do
+          strategy.should_receive(:full_host).and_return('http://example.com')
+
+          lambda{ strategy.call({'PATH_INFO' => '/wowzers/test'}) }.should raise_error("Request Phase")
+
+          strategy.callback_url.should == 'http://example.com/wowzers/test/callback'
+        end
+      end
     end
   end
-end
\ No newline at end of file
+end