diff --git a/library/stdarch/crates/intrinsic-test/src/json_parser.rs b/library/stdarch/crates/intrinsic-test/src/json_parser.rs
index 8b2b8546dfea..70ab51561bcb 100644
--- a/library/stdarch/crates/intrinsic-test/src/json_parser.rs
+++ b/library/stdarch/crates/intrinsic-test/src/json_parser.rs
@@ -17,7 +17,6 @@ struct ReturnType {
 #[serde(untagged, deny_unknown_fields)]
 pub enum ArgPrep {
     Register {
-        #[allow(dead_code)]
         #[serde(rename = "register")]
         #[allow(dead_code)]
         reg: String,