diff --git a/src/waitress/receiver.py b/src/waitress/receiver.py
index 2f0b734a..76633552 100644
--- a/src/waitress/receiver.py
+++ b/src/waitress/receiver.py
@@ -135,7 +135,6 @@ def received(self, s):
                     line = s[:pos]
                     s = s[pos + 2 :]
                     self.control_line = b""
-                    line = line.strip()
 
                     if line:
                         # Begin a new chunk.
@@ -153,9 +152,6 @@ def received(self, s):
 
                             line = line[:semi]
 
-                        # Remove any whitespace
-                        line = line.strip()
-
                         if not ONLY_HEXDIG_RE.match(line):
                             self.error = BadRequest("Invalid chunk size")
                             self.all_chunks_received = True
@@ -164,7 +160,7 @@ def received(self, s):
 
                         # Can not fail due to matching against the regular
                         # expression above
-                        sz = int(line.strip(), 16)  # hexadecimal
+                        sz = int(line, 16)  # hexadecimal
 
                         if sz > 0:
                             # Start a new chunk.
diff --git a/tests/test_receiver.py b/tests/test_receiver.py
index 8e43cc86..d160cac4 100644
--- a/tests/test_receiver.py
+++ b/tests/test_receiver.py
@@ -262,7 +262,9 @@ def test_received_valid_extensions(self, valid_extension):
         assert result == len(data)
         assert inst.error == None
 
-    @pytest.mark.parametrize("invalid_size", [b"0x04", b"+0x04", b"x04", b"+04"])
+    @pytest.mark.parametrize(
+        "invalid_size", [b"0x04", b"+0x04", b"x04", b"+04", b" 04", b" 0x04"]
+    )
     def test_received_invalid_size(self, invalid_size):
         from waitress.utilities import BadRequest