diff --git a/output/src/view.rs b/output/src/view.rs
index f0c88f9..8845f26 100644
--- a/output/src/view.rs
+++ b/output/src/view.rs
@@ -11,7 +11,7 @@ use crate::*;
             fn get_content_sym (&'a $self, value: &Value<'a>) -> Option<RenderBox<'a, $Output>> {
                 if let Value::Sym(s) = value {
                     match *s {
-                        $($sym => Some($body),)*
+                        $($sym => Some($body.boxed()),)*
                         _ => None
                     }
                 } else {