diff --git a/src/libstd/os.rs b/src/libstd/os.rs
index 134cfa89a37f3..b10b74183fea9 100644
--- a/src/libstd/os.rs
+++ b/src/libstd/os.rs
@@ -142,7 +142,7 @@ pub mod win32 {
     }
 
     pub fn as_utf16_p<T>(s: &str, f: |*u16| -> T) -> T {
-        let mut t = s.to_utf16().move_iter().collect::<Vec<u16>>();
+        let mut t = s.to_utf16();
         // Null terminate before passing on.
         t.push(0u16);
         f(t.as_ptr())