diff --git a/rpc/src/authcodes.rs b/rpc/src/authcodes.rs
index c8a0731e3..f1b2a391d 100644
--- a/rpc/src/authcodes.rs
+++ b/rpc/src/authcodes.rs
@@ -176,7 +176,7 @@ impl<T: TimeProvider> AuthCodes<T> {
 		}
 
 		// look for code
-		for mut code in &mut self.codes {
+		for code in &mut self.codes {
 			if &as_token(&code.code) == hash {
 				code.last_used_at = Some(time::Duration::from_secs(now));
 				return true;
diff --git a/rpc/src/v1/extractors.rs b/rpc/src/v1/extractors.rs
index a24722900..1c0fb1322 100644
--- a/rpc/src/v1/extractors.rs
+++ b/rpc/src/v1/extractors.rs
@@ -136,7 +136,7 @@ impl ws::RequestMiddleware for WsExtractor {
 }
 
 fn add_security_headers(res: &mut ws::ws::Response) {
-	let mut headers = res.headers_mut();
+	let headers = res.headers_mut();
 	headers.push(("X-Frame-Options".into(), b"SAMEORIGIN".to_vec()));
 	headers.push(("X-XSS-Protection".into(), b"1; mode=block".to_vec()));
 	headers.push(("X-Content-Type-Options".into(), b"nosniff".to_vec()));