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-rw-r--r--src/libstd/old_io/extensions.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/old_io/extensions.rs b/src/libstd/old_io/extensions.rs
index 441f0a7536e..0e5dd3aa4aa 100644
--- a/src/libstd/old_io/extensions.rs
+++ b/src/libstd/old_io/extensions.rs
@@ -171,7 +171,7 @@ pub fn u64_from_be_bytes(data: &[u8], start: usize, size: usize) -> u64 {
     unsafe {
         let ptr = data.as_ptr().offset(start as isize);
         let out = buf.as_mut_ptr();
-        copy_nonoverlapping(out.offset((8 - size) as isize), ptr, size);
+        copy_nonoverlapping(ptr, out.offset((8 - size) as isize), size);
         (*(out as *const u64)).to_be()
     }
 }