Index: bzr-2.5.1/bzrlib/gpg.py
===================================================================
--- bzr-2.5.1.orig/bzrlib/gpg.py
+++ bzr-2.5.1/bzrlib/gpg.py
@@ -190,7 +190,7 @@ class GPGStrategy(object):
             # use the user email address
             key = config.extract_email_address(self._config_stack.get('email'))
         return [self._config_stack.get('gpg_signing_command'), '--clearsign',
-                '-u', key, '--no-tty']
+                '-u', key]
 
     def sign(self, content):
         if isinstance(content, unicode):
Index: bzr-2.5.1/bzrlib/tests/test_gpg.py
===================================================================
--- bzr-2.5.1.orig/bzrlib/tests/test_gpg.py
+++ bzr-2.5.1/bzrlib/tests/test_gpg.py
@@ -51,7 +51,7 @@ class TestCommandLine(tests.TestCase):
         self.my_gpg = gpg.GPGStrategy(FakeConfig())
 
     def test_signing_command_line(self):
-        self.assertEqual(['false',  '--clearsign', '-u', 'amy@example.com', '--no-tty'],
+        self.assertEqual(['false',  '--clearsign', '-u', 'amy@example.com'],
                          self.my_gpg._command_line())
 
     def test_signing_command_line_from_default(self):
@@ -60,7 +60,7 @@ class TestCommandLine(tests.TestCase):
 email=Amy <amy@example.com>
 gpg_signing_key=default
 gpg_signing_command=false'''))
-        self.assertEqual(['false',  '--clearsign', '-u', 'amy@example.com', '--no-tty'],
+        self.assertEqual(['false',  '--clearsign', '-u', 'amy@example.com'],
                          my_gpg._command_line())
 
     def test_signing_command_line_from_email(self):
@@ -68,7 +68,7 @@ gpg_signing_command=false'''))
         my_gpg = gpg.GPGStrategy(FakeConfig('''
 email=Amy <amy@example.com>
 gpg_signing_command=false'''))
-        self.assertEqual(['false',  '--clearsign', '-u', 'amy@example.com', '--no-tty'],
+        self.assertEqual(['false',  '--clearsign', '-u', 'amy@example.com'],
                          my_gpg._command_line())
 
     def test_checks_return_code(self):