diff --git a/oauth2/__init__.py b/oauth2/__init__.py
index 835270e3..9fca780f 100644
--- a/oauth2/__init__.py
+++ b/oauth2/__init__.py
@@ -481,10 +481,10 @@ def get_normalized_parameters(self):
         # Spaces must be encoded with "%20" instead of "+"
         return encoded_str.replace('+', '%20').replace('%7E', '~')
 
-    def sign_request(self, signature_method, consumer, token):
+    def sign_request(self, signature_method, consumer, token, include_body_hash=True):
         """Set the signature parameter to the result of sign."""
 
-        if not self.is_form_encoded:
+        if not self.is_form_encoded and include_body_hash:
             # according to
             # http://oauth.googlecode.com/svn/spec/ext/body_hash/1.0/oauth-bodyhash.html
             # section 4.1.1 "OAuth Consumers MUST NOT include an
@@ -637,7 +637,7 @@ def set_signature_method(self, method):
         self.method = method
 
     def request(self, uri, method="GET", body='', headers=None, 
-        redirections=httplib2.DEFAULT_MAX_REDIRECTS, connection_type=None):
+        redirections=httplib2.DEFAULT_MAX_REDIRECTS, connection_type=None, include_body_hash=True):
         DEFAULT_POST_CONTENT_TYPE = 'application/x-www-form-urlencoded'
 
         if not isinstance(headers, dict):
@@ -659,7 +659,7 @@ def request(self, uri, method="GET", body='', headers=None,
             token=self.token, http_method=method, http_url=uri, 
             parameters=parameters, body=body, is_form_encoded=is_form_encoded)
 
-        req.sign_request(self.method, self.consumer, self.token)
+        req.sign_request(self.method, self.consumer, self.token, include_body_hash=include_body_hash)
 
         schema, rest = urllib.splittype(uri)
         if rest.startswith('//'):