diff --git a/library/std/src/sys/fs/windows.rs b/library/std/src/sys/fs/windows.rs
index fef3c0665eda1..e3e7b081b47d5 100644
--- a/library/std/src/sys/fs/windows.rs
+++ b/library/std/src/sys/fs/windows.rs
@@ -597,7 +597,7 @@ impl File {
                 (&raw mut info) as *mut c_void,
                 size as u32,
             ))?;
-            attr.file_size = info.AllocationSize as u64;
+            attr.file_size = info.EndOfFile as u64;
             attr.number_of_links = Some(info.NumberOfLinks);
             if attr.attributes & c::FILE_ATTRIBUTE_REPARSE_POINT != 0 {
                 let mut attr_tag: c::FILE_ATTRIBUTE_TAG_INFO = mem::zeroed();