diff --git a/crates/ast_node/src/encoding/decode.rs b/crates/ast_node/src/encoding/decode.rs
index e67ee3022d90..61b404bac36f 100644
--- a/crates/ast_node/src/encoding/decode.rs
+++ b/crates/ast_node/src/encoding/decode.rs
@@ -40,7 +40,11 @@ pub fn expand(DeriveInput { ident, data, .. }: DeriveInput) -> syn::ItemImpl {
                 syn::parse_quote! { #ident ( #(#names),* ) }
             };
 
-            let count = data.fields.len();
+            let count = data
+                .fields
+                .iter()
+                .filter(|field| !is_ignore(&field.attrs))
+                .count();
             let head: Option<syn::Stmt> = (count != 1).then(|| {
                 syn::parse_quote! {
                     let len = <cbor4ii::core::types::Array<()>>::len(reader)?.unwrap();
@@ -193,7 +197,7 @@ pub fn expand(DeriveInput { ident, data, .. }: DeriveInput) -> syn::ItemImpl {
                                     }
                                 })
                                 .collect::<Vec<_>>();
-                            let count = field.fields.len();
+                            let count = names.len();
 
                             let stmt = field.fields.iter()
                                 .zip(names.iter())
diff --git a/crates/ast_node/src/encoding/encode.rs b/crates/ast_node/src/encoding/encode.rs
index e4485f743c2f..107f69982283 100644
--- a/crates/ast_node/src/encoding/encode.rs
+++ b/crates/ast_node/src/encoding/encode.rs
@@ -28,8 +28,9 @@ pub fn expand(DeriveInput { ident, data, .. }: DeriveInput) -> syn::ItemImpl {
                             cbor4ii::core::enc::Encode::encode(&#fieldpath, writer)?;
                         },
                     }
-                });
-            let count = data.fields.len();
+                })
+                .collect::<Vec<_>>();
+            let count = fields.len();
             let head: Option<syn::Stmt> = (count != 1).then(|| {
                 syn::parse_quote! {
                     <cbor4ii::core::types::Array<()>>::bounded(#count, writer)?;