diff --git a/aiohttp/http_writer.py b/aiohttp/http_writer.py
index cd0f0360251..8cab85882fd 100644
--- a/aiohttp/http_writer.py
+++ b/aiohttp/http_writer.py
@@ -27,8 +27,8 @@
 
 MIN_PAYLOAD_FOR_WRITELINES = 2048
 IS_PY313_BEFORE_313_2 = (3, 13, 0) <= sys.version_info < (3, 13, 2)
-IS_BEFORE_312_9 = sys.version_info < (3, 12, 9)
-SKIP_WRITELINES = IS_PY313_BEFORE_313_2 or IS_BEFORE_312_9
+IS_PY_BEFORE_312_9 = sys.version_info < (3, 12, 9)
+SKIP_WRITELINES = IS_PY313_BEFORE_313_2 or IS_PY_BEFORE_312_9
 # writelines is not safe for use
 # on Python 3.12+ until 3.12.9
 # on Python 3.13+ until 3.13.2