diff --git a/scrapy/core/downloader/middleware.py b/scrapy/core/downloader/middleware.py
index 7a6a4dfac..72432558a 100644
--- a/scrapy/core/downloader/middleware.py
+++ b/scrapy/core/downloader/middleware.py
@@ -38,7 +38,7 @@ class DownloaderMiddlewareManager(MiddlewareManager):
                 response = yield method(request=request, spider=spider)
                 if response is not None and not isinstance(response, (Response, Request)):
                     raise _InvalidOutput('Middleware %s.process_request must return None, Response or Request, got %s' % \
-                                         (six.get_method_self(method).__class__.__name__, response.__class__.__name__))
+                                         (method.__self__.__class__.__name__, response.__class__.__name__))
                 if response:
                     defer.returnValue(response)
             defer.returnValue((yield download_func(request=request, spider=spider)))
@@ -53,7 +53,7 @@ class DownloaderMiddlewareManager(MiddlewareManager):
                 response = yield method(request=request, response=response, spider=spider)
                 if not isinstance(response, (Response, Request)):
                     raise _InvalidOutput('Middleware %s.process_response must return Response or Request, got %s' % \
-                                         (six.get_method_self(method).__class__.__name__, type(response)))
+                                         (method.__self__.__class__.__name__, type(response)))
                 if isinstance(response, Request):
                     defer.returnValue(response)
             defer.returnValue(response)
@@ -65,7 +65,7 @@ class DownloaderMiddlewareManager(MiddlewareManager):
                 response = yield method(request=request, exception=exception, spider=spider)
                 if response is not None and not isinstance(response, (Response, Request)):
                     raise _InvalidOutput('Middleware %s.process_exception must return None, Response or Request, got %s' % \
-                                         (six.get_method_self(method).__class__.__name__, type(response)))
+                                         (method.__self__.__class__.__name__, type(response)))
                 if response:
                     defer.returnValue(response)
             defer.returnValue(_failure)
diff --git a/scrapy/core/spidermw.py b/scrapy/core/spidermw.py
index b5f9837ff..57436d2f6 100644
--- a/scrapy/core/spidermw.py
+++ b/scrapy/core/spidermw.py
@@ -37,8 +37,8 @@ class SpiderMiddlewareManager(MiddlewareManager):
 
     def scrape_response(self, scrape_func, response, request, spider):
         fname = lambda f:'%s.%s' % (
-                six.get_method_self(f).__class__.__name__,
-                six.get_method_function(f).__name__)
+                f.__self__.__class__.__name__,
+                f.__func__.__name__)
 
         def process_spider_input(response):
             for method in self.methods['process_spider_input']:
diff --git a/scrapy/utils/reqser.py b/scrapy/utils/reqser.py
index 495564ac0..e961ffca9 100644
--- a/scrapy/utils/reqser.py
+++ b/scrapy/utils/reqser.py
@@ -87,12 +87,12 @@ def _mangle_private_name(obj, func, name):
 def _find_method(obj, func):
     if obj:
         try:
-            func_self = six.get_method_self(func)
+            func_self = func.__self__
         except AttributeError:  # func has no __self__
             pass
         else:
             if func_self is obj:
-                name = six.get_method_function(func).__name__
+                name = func.__func__.__name__
                 if _is_private_method(name):
                     return _mangle_private_name(obj, func, name)
                 return name