diff --git a/src/libstd/sys/windows/os.rs b/src/libstd/sys/windows/os.rs
index af4cb02f527b8..de5f90235c3a7 100644
--- a/src/libstd/sys/windows/os.rs
+++ b/src/libstd/sys/windows/os.rs
@@ -278,7 +278,7 @@ pub struct Args {
     cur: *mut *mut u16,
 }
 
-unsafe fn os_string_from_ptr(ptr: *mut u16) -> OsStringExt {
+unsafe fn os_string_from_ptr(ptr: *mut u16) -> OsString {
     let mut len = 0;
     while *ptr.offset(len) != 0 { len += 1; }