diff --git a/scrapy/core/http2/stream.py b/scrapy/core/http2/stream.py
index 572dbf7aa..8a1b3e470 100644
--- a/scrapy/core/http2/stream.py
+++ b/scrapy/core/http2/stream.py
@@ -15,7 +15,6 @@ from twisted.web.client import ResponseFailed
 from scrapy.http import Request
 from scrapy.http.headers import Headers
 from scrapy.responsetypes import responsetypes
-from scrapy.utils.python import to_unicode
 
 if TYPE_CHECKING:
     from scrapy.core.http2.protocol import H2ClientProtocol