diff --git a/adafruit_requests.py b/adafruit_requests.py
index c09b17f..323ec44 100644
--- a/adafruit_requests.py
+++ b/adafruit_requests.py
@@ -274,7 +274,7 @@ def close(self):
                 self._throw_away(self._remaining)
             elif self._chunked:
                 while True:
-                    chunk_header = self._readto(b"\r\n").split(b";", 1)[0]
+                    chunk_header = _buffer_split0(self._readto(b"\r\n"), b";")
                     chunk_size = int(bytes(chunk_header), 16)
                     if chunk_size == 0:
                         break