diff --git a/canopen/sdo/client.py b/canopen/sdo/client.py
index 421fc3d4..e756035c 100644
--- a/canopen/sdo/client.py
+++ b/canopen/sdo/client.py
@@ -561,7 +561,7 @@ def _retransmit(self):
             response = self.sdo_client.read_response()
             res_command, = struct.unpack_from("B", response)
             seqno = res_command & 0x7F
-            if seqno == self._ackseq + 1:
+            if seqno == 1:
                 # We should be back in sync
                 self._ackseq = seqno
                 return response
diff --git a/test/test_sdo.py b/test/test_sdo.py
index 6fe8544c..2048a6ee 100644
--- a/test/test_sdo.py
+++ b/test/test_sdo.py
@@ -170,6 +170,314 @@ def test_block_upload(self):
             data = fp.read()
         self.assertEqual(data, 'Tiny Node - Mega Domains !')
 
+    def test_sdo_block_upload_retransmit(self):
+        """Send 'the crazy fox jumps over the lazy dog\n' multiple times 
+        and trigger a retransmit by only validating a block partially.
+        """
+        self.data = [
+            (TX, b"\xa4\x08\x10\x00\x7f\x00\x00\x00"),
+            (RX, b"\xc4\x08\x10\x00\x00\x00\x00\x00"),
+            (TX, b"\xa3\x00\x00\x00\x00\x00\x00\x00"),
+            (RX, b"\x01\x74\x68\x65\x20\x63\x72\x61"),
+            (RX, b"\x02\x7a\x79\x20\x66\x6f\x78\x20"),
+            (RX, b"\x03\x6a\x75\x6d\x70\x73\x20\x6f"),
+            (RX, b"\x04\x76\x65\x72\x20\x74\x68\x65"),
+            (RX, b"\x05\x20\x6c\x61\x7a\x79\x20\x64"),
+            (RX, b"\x06\x6f\x67\x0a\x74\x68\x65\x20"),
+            (RX, b"\x07\x63\x72\x61\x7a\x79\x20\x66"),
+            (RX, b"\x08\x6f\x78\x20\x6a\x75\x6d\x70"),
+            (RX, b"\x09\x73\x20\x6f\x76\x65\x72\x20"),
+            (RX, b"\x0a\x74\x68\x65\x20\x6c\x61\x7a"),
+            (RX, b"\x0b\x79\x20\x64\x6f\x67\x0a\x74"),
+            (RX, b"\x0c\x68\x65\x20\x63\x72\x61\x7a"),
+            (RX, b"\x0d\x79\x20\x66\x6f\x78\x20\x6a"),
+            (RX, b"\x0e\x75\x6d\x70\x73\x20\x6f\x76"),
+            (RX, b"\x0f\x65\x72\x20\x74\x68\x65\x20"),
+            (RX, b"\x10\x6c\x61\x7a\x79\x20\x64\x6f"),
+            (RX, b"\x11\x67\x0a\x74\x68\x65\x20\x63"),
+            (RX, b"\x12\x72\x61\x7a\x79\x20\x66\x6f"),
+            (RX, b"\x13\x78\x20\x6a\x75\x6d\x70\x73"),
+            (RX, b"\x14\x20\x6f\x76\x65\x72\x20\x74"),
+            (RX, b"\x15\x68\x65\x20\x6c\x61\x7a\x79"),
+            (RX, b"\x16\x20\x64\x6f\x67\x0a\x74\x68"),
+            (RX, b"\x17\x65\x20\x63\x72\x61\x7a\x79"),
+            (RX, b"\x18\x20\x66\x6f\x78\x20\x6a\x75"),
+            (RX, b"\x19\x6d\x70\x73\x20\x6f\x76\x65"),
+            (RX, b"\x1a\x72\x20\x74\x68\x65\x20\x6c"),
+            (RX, b"\x1b\x61\x7a\x79\x20\x64\x6f\x67"),
+            (RX, b"\x1c\x0a\x74\x68\x65\x20\x63\x72"),
+            (RX, b"\x1d\x61\x7a\x79\x20\x66\x6f\x78"),
+            (RX, b"\x1e\x20\x6a\x75\x6d\x70\x73\x20"),
+            (RX, b"\x1f\x6f\x76\x65\x72\x20\x74\x68"),
+            (RX, b"\x20\x65\x20\x6c\x61\x7a\x79\x20"),
+            (RX, b"\x21\x64\x6f\x67\x0a\x74\x68\x65"),
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+            (RX, b"\x23\x66\x6f\x78\x20\x6a\x75\x6d"),
+            (RX, b"\x24\x70\x73\x20\x6f\x76\x65\x72"),
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+            (RX, b"\x26\x7a\x79\x20\x64\x6f\x67\x0a"),
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+            (RX, b"\x2a\x76\x65\x72\x20\x74\x68\x65"),
+            (RX, b"\x2b\x20\x6c\x61\x7a\x79\x20\x64"),
+            (RX, b"\x2c\x6f\x67\x0a\x74\x68\x65\x20"),
+            (RX, b"\x2d\x63\x72\x61\x7a\x79\x20\x66"),
+            (RX, b"\x2e\x6f\x78\x20\x6a\x75\x6d\x70"),
+            (RX, b"\x2f\x73\x20\x6f\x76\x65\x72\x20"),
+            (RX, b"\x30\x74\x68\x65\x20\x6c\x61\x7a"),
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+            (RX, b"\x32\x68\x65\x20\x63\x72\x61\x7a"),
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+            (RX, b"\x34\x75\x6d\x70\x73\x20\x6f\x76"),  # --> Wrong seqno (x34 instead of x33)
+            (RX, b"\x35\x65\x72\x20\x74\x68\x65\x20"),  # All the following frames until end of block
+            (RX, b"\x36\x6c\x61\x7a\x79\x20\x64\x6f"),  # will be ignored by the client and should be 
+            (RX, b"\x37\x67\x0a\x74\x68\x65\x20\x63"),  # resent by server.
+            (RX, b"\x38\x72\x61\x7a\x79\x20\x66\x6f"),
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+            (RX, b"\x59\x6d\x70\x73\x20\x6f\x76\x65"),
+            (RX, b"\x5a\x72\x20\x74\x68\x65\x20\x6c"),
+            (RX, b"\x5b\x61\x7a\x79\x20\x64\x6f\x67"),
+            (RX, b"\x5c\x0a\x74\x68\x65\x20\x63\x72"),
+            (RX, b"\x5d\x61\x7a\x79\x20\x66\x6f\x78"),
+            (RX, b"\x5e\x20\x6a\x75\x6d\x70\x73\x20"),
+            (RX, b"\x5f\x6f\x76\x65\x72\x20\x74\x68"),
+            (RX, b"\x60\x65\x20\x6c\x61\x7a\x79\x20"),
+            (RX, b"\x61\x64\x6f\x67\x0a\x74\x68\x65"),
+            (RX, b"\x62\x20\x63\x72\x61\x7a\x79\x20"),
+            (RX, b"\x63\x66\x6f\x78\x20\x6a\x75\x6d"),
+            (RX, b"\x64\x70\x73\x20\x6f\x76\x65\x72"),
+            (RX, b"\x65\x20\x74\x68\x65\x20\x6c\x61"),
+            (RX, b"\x66\x7a\x79\x20\x64\x6f\x67\x0a"),
+            (RX, b"\x67\x74\x68\x65\x20\x63\x72\x61"),
+            (RX, b"\x68\x7a\x79\x20\x66\x6f\x78\x20"),
+            (RX, b"\x69\x6a\x75\x6d\x70\x73\x20\x6f"),
+            (RX, b"\x6a\x76\x65\x72\x20\x74\x68\x65"),
+            (RX, b"\x6b\x20\x6c\x61\x7a\x79\x20\x64"),
+            (RX, b"\x6c\x6f\x67\x0a\x74\x68\x65\x20"),
+            (RX, b"\x6d\x63\x72\x61\x7a\x79\x20\x66"),
+            (RX, b"\x6e\x6f\x78\x20\x6a\x75\x6d\x70"),
+            (RX, b"\x6f\x73\x20\x6f\x76\x65\x72\x20"),
+            (RX, b"\x70\x74\x68\x65\x20\x6c\x61\x7a"),
+            (RX, b"\x71\x79\x20\x64\x6f\x67\x0a\x74"),
+            (RX, b"\x72\x68\x65\x20\x63\x72\x61\x7a"),
+            (RX, b"\x73\x79\x20\x66\x6f\x78\x20\x6a"),
+            (RX, b"\x74\x75\x6d\x70\x73\x20\x6f\x76"),
+            (RX, b"\x75\x65\x72\x20\x74\x68\x65\x20"),
+            (RX, b"\x76\x6c\x61\x7a\x79\x20\x64\x6f"),
+            (RX, b"\x77\x67\x0a\x74\x68\x65\x20\x63"),
+            (RX, b"\x78\x72\x61\x7a\x79\x20\x66\x6f"),
+            (RX, b"\x79\x78\x20\x6a\x75\x6d\x70\x73"),
+            (RX, b"\x7a\x20\x6f\x76\x65\x72\x20\x74"),
+            (RX, b"\x7b\x68\x65\x20\x6c\x61\x7a\x79"),
+            (RX, b"\x7c\x20\x64\x6f\x67\x0a\x74\x68"),
+            (RX, b"\x7d\x65\x20\x63\x72\x61\x7a\x79"),
+            (RX, b"\x7e\x20\x66\x6f\x78\x20\x6a\x75"),
+            (RX, b"\x7f\x6d\x70\x73\x20\x6f\x76\x65"),
+            (TX, b"\xa2\x7f\x7f\x00\x00\x00\x00\x00"), # --> This block is acknlowedged without issues
+            (RX, b"\x01\x72\x20\x74\x68\x65\x20\x6c"),
+            (RX, b"\x02\x61\x7a\x79\x20\x64\x6f\x67"),
+            (RX, b"\x03\x0a\x74\x68\x65\x20\x63\x72"),
+            (RX, b"\x04\x61\x7a\x79\x20\x66\x6f\x78"),
+            (RX, b"\x05\x20\x6a\x75\x6d\x70\x73\x20"),
+            (RX, b"\x06\x6f\x76\x65\x72\x20\x74\x68"),
+            (RX, b"\x07\x65\x20\x6c\x61\x7a\x79\x20"),
+            (RX, b"\x08\x64\x6f\x67\x0a\x74\x68\x65"),
+            (RX, b"\x09\x20\x63\x72\x61\x7a\x79\x20"),
+            (RX, b"\x0a\x66\x6f\x78\x20\x6a\x75\x6d"),
+            (RX, b"\x0b\x70\x73\x20\x6f\x76\x65\x72"),
+            (RX, b"\x0c\x20\x74\x68\x65\x20\x6c\x61"),
+            (RX, b"\x0d\x7a\x79\x20\x64\x6f\x67\x0a"),
+            (RX, b"\x0e\x74\x68\x65\x20\x63\x72\x61"),
+            (RX, b"\x0f\x7a\x79\x20\x66\x6f\x78\x20"),
+            (RX, b"\x10\x6a\x75\x6d\x70\x73\x20\x6f"),
+            (RX, b"\x11\x76\x65\x72\x20\x74\x68\x65"),
+            (RX, b"\x12\x20\x6c\x61\x7a\x79\x20\x64"),
+            (RX, b"\x13\x6f\x67\x0a\x74\x68\x65\x20"),
+            (RX, b"\x14\x63\x72\x61\x7a\x79\x20\x66"),
+            (RX, b"\x15\x6f\x78\x20\x6a\x75\x6d\x70"),
+            (RX, b"\x16\x73\x20\x6f\x76\x65\x72\x20"),
+            (RX, b"\x17\x74\x68\x65\x20\x6c\x61\x7a"),
+            (RX, b"\x18\x79\x20\x64\x6f\x67\x0a\x74"),
+            (RX, b"\x19\x68\x65\x20\x63\x72\x61\x7a"),
+            (RX, b"\x1a\x79\x20\x66\x6f\x78\x20\x6a"),
+            (RX, b"\x1b\x75\x6d\x70\x73\x20\x6f\x76"),
+            (RX, b"\x1c\x65\x72\x20\x74\x68\x65\x20"),
+            (RX, b"\x1d\x6c\x61\x7a\x79\x20\x64\x6f"),
+            (RX, b"\x1e\x67\x0a\x74\x68\x65\x20\x63"),
+            (RX, b"\x1f\x72\x61\x7a\x79\x20\x66\x6f"),
+            (RX, b"\x20\x78\x20\x6a\x75\x6d\x70\x73"),
+            (RX, b"\x21\x20\x6f\x76\x65\x72\x20\x74"),
+            (RX, b"\x22\x68\x65\x20\x6c\x61\x7a\x79"),
+            (RX, b"\xa3\x20\x64\x6f\x67\x0a\x00\x00"),
+            (TX, b"\xa2\x23\x7f\x00\x00\x00\x00\x00"),
+            (RX, b"\xc9\x3b\x49\x00\x00\x00\x00\x00"),
+            (TX, b"\xa1\x00\x00\x00\x00\x00\x00\x00"), # --> Transfer ends without issues
+        ]
+        data = []
+        with self.network[2].sdo[0x1008].open("r", block_transfer=True) as fp:
+            data = fp.read()
+        assert data == 39 * "the crazy fox jumps over the lazy dog\n"
+
     def test_writable_file(self):
         self.data = [
             (TX, b'\x20\x00\x20\x00\x00\x00\x00\x00'),