diff --git a/NEWS b/NEWS
index e49f384b..c128ceca 100644
--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,7 @@ What's new in psycopg 2.5
 
   - Added JSON adaptation.
   - Added support for PostgreSQL 9.2 range types.
+  - Added support for Python 3.3.
   - 'connection' and 'cursor' objects can be used in 'with' statements
     as context managers as specified by recent DBAPI extension.
   - Added support for backward scrollable cursors. Thanks to Jon Nelson
diff --git a/psycopg/typecast_binary.c b/psycopg/typecast_binary.c
index 49eb547f..d63c7025 100644
--- a/psycopg/typecast_binary.c
+++ b/psycopg/typecast_binary.c
@@ -55,7 +55,6 @@ chunk_repr(chunkObject *self)
 
 #if PY_MAJOR_VERSION < 3
 
-/* XXX support 3.0 buffer protocol */
 static Py_ssize_t
 chunk_getreadbuffer(chunkObject *self, Py_ssize_t segment, void **ptr)
 {
@@ -90,9 +89,15 @@ static PyBufferProcs chunk_as_buffer =
 /* 3.0 buffer interface */
 int chunk_getbuffer(PyObject *_self, Py_buffer *view, int flags)
 {
+    int rv;
     chunkObject *self = (chunkObject*)_self;
-    return PyBuffer_FillInfo(view, _self, self->base, self->len, 1, flags);
+    rv = PyBuffer_FillInfo(view, _self, self->base, self->len, 1, flags);
+    if (rv == 0) {
+        view->format = "c";
+    }
+    return rv;
 }
+
 static PyBufferProcs chunk_as_buffer =
 {
     chunk_getbuffer,
diff --git a/setup.py b/setup.py
index b48fab5a..3791c149 100644
--- a/setup.py
+++ b/setup.py
@@ -347,14 +347,15 @@ class psycopg_build_ext(build_ext):
         self.libraries.append('ssl')
         self.libraries.append('crypto')
 
-    def finalize_linux2(self):
+    def finalize_linux(self):
         """Finalize build system configuration on GNU/Linux platform."""
         # tell piro that GCC is fine and dandy, but not so MS compilers
         for extension in self.extensions:
             extension.extra_compile_args.append(
                 '-Wdeclaration-after-statement')
 
-    finalize_linux3 = finalize_linux2
+    finalize_linux2 = finalize_linux
+    finalize_linux3 = finalize_linux
 
     def finalize_options(self):
         """Complete the build system configuation."""
diff --git a/tests/test_types_basic.py b/tests/test_types_basic.py
index e442fc62..c2a47e93 100755
--- a/tests/test_types_basic.py
+++ b/tests/test_types_basic.py
@@ -126,7 +126,7 @@ class TypesBasicTests(unittest.TestCase):
             s = bytes(range(256))
             b = psycopg2.Binary(s)
             buf = self.execute("SELECT %s::bytea AS foo", (b,))
-            self.assertEqual(s, buf)
+            self.assertEqual(s, buf.tobytes())
 
     def testBinaryNone(self):
         b = psycopg2.Binary(None)
@@ -154,7 +154,7 @@ class TypesBasicTests(unittest.TestCase):
             s = bytes(range(256))
             buf = self.execute("SELECT %s::bytea AS foo", (psycopg2.Binary(s),))
             buf2 = self.execute("SELECT %s::bytea AS foo", (buf,))
-            self.assertEqual(s, buf2)
+            self.assertEqual(s, buf2.tobytes())
 
     def testArray(self):
         s = self.execute("SELECT %s AS foo", ([[1,2],[3,4]],))