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-rw-r--r--library/std/src/sys/windows/pipe.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/library/std/src/sys/windows/pipe.rs b/library/std/src/sys/windows/pipe.rs
index 0780b2958..d07147ecc 100644
--- a/library/std/src/sys/windows/pipe.rs
+++ b/library/std/src/sys/windows/pipe.rs
@@ -373,7 +373,7 @@ impl AnonPipe {
// Asynchronous read of the pipe.
// If successful, `callback` will be called once it completes.
- let result = io(self.inner.as_handle(), buf, len, &mut overlapped, callback);
+ let result = io(self.inner.as_handle(), buf, len, &mut overlapped, Some(callback));
if result == c::FALSE {
// We can return here because the call failed.
// After this we must not return until the I/O completes.