diff --git a/src/comp/pretty/pprust.rs b/src/comp/pretty/pprust.rs
index ed73cb936b2..43165cf1b3a 100644
--- a/src/comp/pretty/pprust.rs
+++ b/src/comp/pretty/pprust.rs
@@ -47,7 +47,7 @@ fn rust_printer(io::writer writer) -> ps {
              cm=option::none[codemap],
              comments=option::none[vec[lexer::cmnt]],
              mutable cur_cmnt=0u,
-             mutable boxes = boxes,
+             mutable boxes=boxes,
              mode=mo_untyped);
 }