diff --git a/swagger_zipkin/zipkin_decorator.py b/swagger_zipkin/zipkin_decorator.py
index d6146bf..f147bbd 100644
--- a/swagger_zipkin/zipkin_decorator.py
+++ b/swagger_zipkin/zipkin_decorator.py
@@ -20,6 +20,9 @@ def __init__(self, resource):
     def __getattr__(self, name):
         return decorate_client(self.resource, self.with_headers, name)
 
+    def __call__(self, *args, **kwargs):
+        return self.resource(*args, **kwargs)
+
     def with_headers(self, call_name, *args, **kwargs):
         kwargs.setdefault('_request_options', {})
         headers = kwargs['_request_options'].setdefault('headers', {})
diff --git a/tests/zipkin_decorator_test.py b/tests/zipkin_decorator_test.py
index cf3b815..cf2137b 100644
--- a/tests/zipkin_decorator_test.py
+++ b/tests/zipkin_decorator_test.py
@@ -29,6 +29,22 @@ def create_request_options(trace_id, span_id, parent_span_id):
     }
 
 
+def create_client():
+    class V1Operation():
+        def foo():
+            return 'foo'
+
+    class Client(object):
+        def __init__(self):
+            self.v1 = V1Operation()
+
+        def func(self):
+            return 'some func'
+
+    client = Client()
+    return client
+
+
 def test_client_request_option_decorator():
     trace_id = 'trace_id'
     span_id = 'span_id'
@@ -60,15 +76,13 @@ def test_client_request_option_decorator():
 
 
 def test_client_dir():
-    class V1Operation():
-        def foo():
-            return 'foo'
-
-    class Client(object):
-        def __init__(self):
-            self.v1 = V1Operation()
-
-    client = Client()
+    client = create_client()
     wrapped_client = ZipkinClientDecorator(client)
 
     assert 'foo' in dir(wrapped_client.v1)
+
+
+def test_callable():
+    client = create_client()
+    wrapped_client = ZipkinClientDecorator(client)
+    assert 'some func' == wrapped_client.func()