diff --git a/crates/wiggle/generate/src/lib.rs b/crates/wiggle/generate/src/lib.rs
index 90cca766d1..cecd610b50 100644
--- a/crates/wiggle/generate/src/lib.rs
+++ b/crates/wiggle/generate/src/lib.rs
@@ -38,17 +38,6 @@ pub fn generate(doc: &witx::Document, names: &Names, settings: &CodegenSettings)
         }
     });
 
-    let guest_error_methods = doc.error_types().map(|t| {
-        let typename = names.type_ref(&t, anon_lifetime());
-        let err_method = names.guest_error_conversion_method(&t);
-        quote!(fn #err_method(&self, e: #rt::GuestError) -> #typename;)
-    });
-    let guest_error_conversion = quote! {
-        pub trait GuestErrorConversion {
-            #(#guest_error_methods)*
-        }
-    };
-
     let user_error_methods = settings.errors.iter().map(|errtype| {
         let abi_typename = names.type_ref(&errtype.abi_type(), anon_lifetime());
         let user_typename = errtype.typename();
@@ -82,7 +71,6 @@ pub fn generate(doc: &witx::Document, names: &Names, settings: &CodegenSettings)
 
             #(#types)*
             #(#constants)*
-            #guest_error_conversion
             #user_error_conversion
         }
         #(#modules)*
diff --git a/crates/wiggle/generate/src/names.rs b/crates/wiggle/generate/src/names.rs
index ae3b6bc74b..087b753d18 100644
--- a/crates/wiggle/generate/src/names.rs
+++ b/crates/wiggle/generate/src/names.rs
@@ -196,11 +196,6 @@ impl Names {
         }
     }
 
-    pub fn guest_error_conversion_method(&self, tref: &TypeRef) -> Ident {
-        let suffix = Self::snake_typename(tref);
-        format_ident!("into_{}", suffix)
-    }
-
     pub fn user_error_conversion_method(&self, user_type: &UserErrorType) -> Ident {
         let abi_type = Self::snake_typename(&user_type.abi_type());
         format_ident!(