diff --git a/crates/wasi-nn/src/witx.rs b/crates/wasi-nn/src/witx.rs
index 6f7394e0b2..b686fcd091 100644
--- a/crates/wasi-nn/src/witx.rs
+++ b/crates/wasi-nn/src/witx.rs
@@ -22,7 +22,7 @@ impl types::GuestErrorConversion for WasiNnCtx {
 }
 
 impl<'a> types::UserErrorConversion for WasiNnCtx {
-    fn errno_from_wasi_nn_error(&self, e: WasiNnError) -> Result<Errno, String> {
+    fn errno_from_wasi_nn_error(&self, e: WasiNnError) -> Result<Errno, wiggle::Trap> {
         eprintln!("Host error: {:?}", e);
         match e {
             WasiNnError::OpenvinoError(_) => unimplemented!(),