diff --git a/kittens/transfer/rsync.c b/kittens/transfer/rsync.c
index 0e1691bb4..95f24a9d7 100644
--- a/kittens/transfer/rsync.c
+++ b/kittens/transfer/rsync.c
@@ -127,7 +127,7 @@ begin_load_signature(PyObject *self UNUSED, PyObject *args UNUSED) {
 static PyObject*
 build_hash_table(PyObject *self UNUSED, PyObject *args) {
     PyObject *sig_capsule;
-    if (!PyArg_ParseTuple(args, "O!y#|p", &PyCapsule_Type, &sig_capsule)) return NULL;
+    if (!PyArg_ParseTuple(args, "O!", &PyCapsule_Type, &sig_capsule)) return NULL;
     GET_SIG_FROM_CAPSULE;
     rs_result res = rs_build_hash_table(sig);
     if (res != RS_DONE) {
diff --git a/kitty/file_transmission.py b/kitty/file_transmission.py
index 438027711..5394bad01 100644
--- a/kitty/file_transmission.py
+++ b/kitty/file_transmission.py
@@ -88,7 +88,7 @@ class TransmissionError(Exception):
         name: str = '',
         size: int = -1
     ) -> None:
-        Exception.__init__(self, msg)
+        super().__init__(msg)
         self.transmit = transmit
         self.file_id = file_id
         self.human_msg = msg
diff --git a/kitty_tests/__init__.py b/kitty_tests/__init__.py
index cf2772879..ccfcda37b 100644
--- a/kitty_tests/__init__.py
+++ b/kitty_tests/__init__.py
@@ -108,7 +108,7 @@ def filled_history_buf(ynum=5, xnum=5, cursor=Cursor()):
 class BaseTest(TestCase):
 
     ae = TestCase.assertEqual
-    maxDiff = 2000
+    maxDiff = 2048
     is_ci = os.environ.get('CI') == 'true'
 
     def set_options(self, options=None):