diff --git a/src/chunks.jl b/src/chunks.jl
index f918bba..9faec58 100644
--- a/src/chunks.jl
+++ b/src/chunks.jl
@@ -81,8 +81,6 @@ mutable struct InlineCode <: Inline
     end
 end
 
-mutable struct TermResult end
-
-mutable struct ScriptResult end
-
-mutable struct CollectResult end
+struct TermResult end
+struct ScriptResult end
+struct CollectResult end