diff --git a/mordant-baseline.toml b/mordant-baseline.toml
index 109483f7b029..fddc96426ab9 100644
--- a/mordant-baseline.toml
+++ b/mordant-baseline.toml
@@ -73,7 +73,6 @@
 "parallel_vecs:src/runtime/api/html_rewriter.rs" = 1
 "parallel_vecs:src/runtime/bake/dev_server/incremental_graph.rs" = 1
 "reimplemented_helper:src/runtime/api/bun/Terminal.rs" = 1
-"reimplemented_helper:src/runtime/ffi/abi_type.rs" = 1
 "reimplemented_helper:src/runtime/hw_exports.rs" = 1
 "same_match_twice:src/runtime/api/YAMLObject.rs" = 1
 "same_match_twice:src/runtime/api/bun/h2_frame_parser.rs" = 1
diff --git a/src/runtime/ffi/abi_type.rs b/src/runtime/ffi/abi_type.rs
index 32dc51c65896..dec1591b6faf 100644
--- a/src/runtime/ffi/abi_type.rs
+++ b/src/runtime/ffi/abi_type.rs
@@ -102,8 +102,7 @@ bun_core::comptime_string_map! {
 }
 
 // ─────────────────────────────────────────────────────────────────────────────
-// Per-variant string table — single source of truth for the four exhaustive
-// matches that previously lived in typename_label / param_typename_label /
+// Per-variant string table — single source of truth for typename_label /
 // ToCFormatter / ToJSFormatter. Indexed by `self as usize`.
 // ─────────────────────────────────────────────────────────────────────────────
 
@@ -225,14 +224,6 @@ impl ABIType {
     pub(crate) fn typename_label(self) -> &'static [u8] {
         self.row().c_type
     }
-
-    pub(crate) fn param_typename(
-        self,
-        writer: &mut impl std::io::Write,
-    ) -> Result<(), crate::Error> {
-        writer.write_all(self.typename_label())?;
-        Ok(())
-    }
 }
 
 pub struct ToCFormatter<'a> {
diff --git a/src/runtime/ffi/ffi_body.rs b/src/runtime/ffi/ffi_body.rs
index e64f2e8830f4..1a24b794c0b4 100644
--- a/src/runtime/ffi/ffi_body.rs
+++ b/src/runtime/ffi/ffi_body.rs
@@ -2135,7 +2135,7 @@ impl Function {
                 writer.write_all(b", ")?;
             }
             first = false;
-            arg.param_typename(writer)?;
+            arg.typename(writer)?;
             write!(writer, " arg{}", i)?;
         }
         writer.write_all(