diff --git a/src/servo/css/styles.rs b/src/servo/css/styles.rs
index b7efc79cda9..64b8757746c 100644
--- a/src/servo/css/styles.rs
+++ b/src/servo/css/styles.rs
@@ -47,7 +47,7 @@ impl NodeKind : DefaultStyleMethods {
               UnknownElement => DisInline,
             }
           },
-            _ => fail ~"unstyleable node type encountered"
+          Comment(*) | Doctype(*) => DisNone
         }
     }