diff --git a/keystore/keymaster_worker.cpp b/keystore/keymaster_worker.cpp
index c7d2671..fd07e86 100644
--- a/keystore/keymaster_worker.cpp
+++ b/keystore/keymaster_worker.cpp
@@ -346,7 +346,7 @@
         {
             hidl_vec<uint8_t> clientId;
             hidl_vec<uint8_t> appData;
-            for (auto param : opParams) {
+            for (const auto& param : opParams) {
                 if (param.tag == Tag::APPLICATION_ID) {
                     clientId = authorizationValue(TAG_APPLICATION_ID, param).value();
                 } else if (param.tag == Tag::APPLICATION_DATA) {