diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index 2263c0b4503a60e2ccd6c0dca6404cf8421120cb..bd6e4db4c266acb2348283e263588f8a43d8ea92 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -8278,7 +8278,6 @@ fn fileReadStreamingWindows(file: File, data: []const []u8) File.Reader.Error!us
                 return e;
             },
         };
-        defer alertable_syscall.finish();
         waitForApcOrAlert();
         while (@atomicLoad(windows.NTSTATUS, &io_status_block.u.Status, .acquire) == .PENDING) {
             alertable_syscall.checkCancel() catch |err| switch (err) {
@@ -8289,6 +8288,7 @@ fn fileReadStreamingWindows(file: File, data: []const []u8) File.Reader.Error!us
             };
             waitForApcOrAlert();
         }
+        alertable_syscall.finish();
     }
     switch (io_status_block.u.Status) {
         .SUCCESS, .END_OF_FILE, .PIPE_BROKEN => return io_status_block.Information,