1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/sys/common/wtf8.rs b/src/libstd/sys/common/wtf8.rs
index 315df411179..8f788988e55 100644
--- a/src/libstd/sys/common/wtf8.rs
+++ b/src/libstd/sys/common/wtf8.rs
@@ -344,8 +344,8 @@ impl Wtf8Buf {
                 Some((surrogate_pos, _)) => {
                     pos = surrogate_pos + 3;
                     slice::bytes::copy_memory(
+                        UTF8_REPLACEMENT_CHARACTER,
                         &mut self.bytes[surrogate_pos .. pos],
-                        UTF8_REPLACEMENT_CHARACTER
                     );
                 },
                 None => return unsafe { String::from_utf8_unchecked(self.bytes) }