diff --git a/src/export/html.rs b/src/export/html.rs
index e0b0bd1..47ccb8c 100644
--- a/src/export/html.rs
+++ b/src/export/html.rs
@@ -49,7 +49,7 @@ impl<S: AsRef<str>> fmt::Display for HtmlEscape<S> {
     }
 }
 
-pub trait HtmlHandler<E: From<Error>>: Default {
+pub trait HtmlHandler<E: From<Error>> {
     fn start<W: Write>(&mut self, w: W, element: &Element) -> Result<(), E>;
     fn end<W: Write>(&mut self, w: W, element: &Element) -> Result<(), E>;
 }