diff --git a/src/click/_termui_impl.py b/src/click/_termui_impl.py
index a3af250c3..77edbd9ab 100644
--- a/src/click/_termui_impl.py
+++ b/src/click/_termui_impl.py
@@ -424,7 +424,6 @@ def _pipepager(generator: cabc.Iterable[str], cmd: str, color: bool | None) -> N
                 text = strip_ansi(text)
 
             stdin.write(text.encode(encoding, "replace"))
-            stdin.flush()
     except Exception as e:
         # In case there is an exception we want to close the pager immediately
         # and let the caller handle it.