diff --git a/google/_async_resumable_media/requests/download.py b/google/_async_resumable_media/requests/download.py
index 2b3e48ce..5b10e12e 100644
--- a/google/_async_resumable_media/requests/download.py
+++ b/google/_async_resumable_media/requests/download.py
@@ -90,7 +90,8 @@ async def _write_to_stream(self, response):
             self._stream.write(chunk)
             local_checksum_object.update(chunk)
 
-        if expected_checksum is not None:
+        # Don't validate the checksum for partial responses.
+        if expected_checksum is not None and response.status != 206:
             actual_checksum = sync_helpers.prepare_checksum_digest(
                 checksum_object.digest()
             )
@@ -213,7 +214,8 @@ async def _write_to_stream(self, response):
             self._stream.write(chunk)
             checksum_object.update(chunk)
 
-        if expected_checksum is not None:
+        # Don't validate the checksum for partial responses.
+        if expected_checksum is not None and response.status != 206:
             actual_checksum = sync_helpers.prepare_checksum_digest(
                 checksum_object.digest()
             )
diff --git a/google/resumable_media/requests/download.py b/google/resumable_media/requests/download.py
index 88de223f..d202d56e 100644
--- a/google/resumable_media/requests/download.py
+++ b/google/resumable_media/requests/download.py
@@ -124,7 +124,8 @@ def _write_to_stream(self, response):
                 self._bytes_downloaded += len(chunk)
                 local_checksum_object.update(chunk)
 
-        if expected_checksum is not None:
+        # Don't validate the checksum for partial responses.
+        if expected_checksum is not None and response.status_code != 206:
             actual_checksum = _helpers.prepare_checksum_digest(checksum_object.digest())
             if actual_checksum != expected_checksum:
                 msg = _CHECKSUM_MISMATCH.format(
@@ -308,7 +309,8 @@ def _write_to_stream(self, response):
                 checksum_object.update(chunk)
             response._content_consumed = True
 
-        if expected_checksum is not None:
+        # Don't validate the checksum for partial responses.
+        if expected_checksum is not None and response.status_code != 206:
             actual_checksum = _helpers.prepare_checksum_digest(checksum_object.digest())
 
             if actual_checksum != expected_checksum: