1 files changed, 1 insertions, 0 deletions
diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs
index 76d9f755d3c..0a5e20fc2b2 100644
--- a/src/libsyntax/ext/build.rs
+++ b/src/libsyntax/ext/build.rs
@@ -728,6 +728,7 @@ impl AstBuilder for @ExtCtxt {
             inputs: inputs,
             output: output,
             cf: ast::return_val,
+            variadic: false
         }
     }