diff --git a/datasette/views/base.py b/datasette/views/base.py
index 7262edb..e773000 100644
--- a/datasette/views/base.py
+++ b/datasette/views/base.py
@@ -1,6 +1,7 @@
 import csv
 import hashlib
 import sys
+from itertools import repeat
 
 from datasette.utils import (
     EscapeHtmlWriter,
@@ -247,6 +248,9 @@ async def stream_csv(datasette, fetch_data, request, database):
             writer = csv.writer(limited_writer)
         first = True
         next = None
+        # Infinite iterator: any(map(isinstance, row, repeat_bytes)) checks
+        # each cell of a row for bytes without a per-row Python generator
+        repeat_bytes = repeat(bytes)
         while first or (next and stream):
             try:
                 kwargs = {}
@@ -260,7 +264,7 @@ async def stream_csv(datasette, fetch_data, request, database):
                     first = False
                 next = data.get("next")
                 for row in data["rows"]:
-                    if any(isinstance(r, bytes) for r in row):
+                    if any(map(isinstance, row, repeat_bytes)):
                         new_row = []
                         for column, cell in zip(headings, row):
                             if isinstance(cell, bytes):