diff --git a/crates/wasi-c2/src/dir.rs b/crates/wasi-c2/src/dir.rs
index ebae4d657b..671b072810 100644
--- a/crates/wasi-c2/src/dir.rs
+++ b/crates/wasi-c2/src/dir.rs
@@ -273,10 +273,7 @@ impl WasiDir for cap_std::fs::Dir {
             let meta = entry.metadata()?;
             let inode = meta.ino();
             let filetype = FileType::from(&meta.file_type());
-            let name = entry
-                .file_name()
-                .into_string()
-                .map_err(|_| Error::Utf8(todo!()))?;
+            let name = entry.file_name().into_string().map_err(|_| Error::Ilseq)?;
             let namelen = name.as_bytes().len().try_into()?;
             let entity = ReaddirEntity {
                 next: ReaddirCursor::from(ix as u64 + 1),
diff --git a/crates/wasi-c2/src/snapshots/preview_1.rs b/crates/wasi-c2/src/snapshots/preview_1.rs
index 7d489cd304..3ede1f84df 100644
--- a/crates/wasi-c2/src/snapshots/preview_1.rs
+++ b/crates/wasi-c2/src/snapshots/preview_1.rs
@@ -744,7 +744,7 @@ impl<'a> wasi_snapshot_preview1::WasiSnapshotPreview1 for WasiCtx {
             .read_link(path.deref())?
             .into_os_string()
             .into_string()
-            .map_err(|_| Error::Utf8(todo!()))?;
+            .map_err(|_| Error::Ilseq)?;
         let link_bytes = link.as_bytes();
         let link_len = link_bytes.len();
         if link_len > buf_len as usize {