2 files changed, 21 insertions, 2 deletions
diff --git a/src/lib.rs b/src/lib.rs
index 2e0129e..a190cb9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,7 +9,6 @@ use quote::quote;
 use quote::quote_spanned;
 use quote::ToTokens;
 use syn::parse_macro_input;
-use syn::punctuated::Punctuated;
 use syn::spanned::Spanned;
 use syn::token::Brace;
 use syn::token::Gt;
@@ -171,7 +170,15 @@ pub fn dynamize(_attr: TokenStream, input: TokenStream) -> TokenStream {
         trait_token: Trait::default(),
         generics: original_trait.generics.clone(),
         colon_token: None,
-        supertraits: Punctuated::new(),
+        supertraits: original_trait
+            .supertraits
+            .iter()
+            .filter(|t| match t {
+                TypeParamBound::Trait(t) => !t.path.is_ident("Sized"),
+                TypeParamBound::Lifetime(_) => true,
+            })
+            .cloned()
+            .collect(),
         brace_token: Brace::default(),
         items: Vec::new(),
     };
diff --git a/tests/tests.rs b/tests/tests.rs
index 3a14811..448af64 100644
--- a/tests/tests.rs
+++ b/tests/tests.rs
@@ -187,3 +187,15 @@ fn type_trait_bound_static_test(
 ) -> Option<Box<dyn std::error::Error>> {
     t.foobar("test").err()
 }
+
+#[dynamize::dynamize]
+trait TypeWithSuper: std::fmt::Display + Sized {
+    type A: std::error::Error;
+
+    fn foobar(&self, text: &str) -> Result<i32, Self::A>;
+}
+
+fn test3<T: TypeWithSuper>(some: T) {
+    let dyn_trait: &dyn DynTypeWithSuper = &some;
+    println!("{}", dyn_trait);
+}