diff --git a/wifi/aidl/default/wifi_legacy_hal.cpp b/wifi/aidl/default/wifi_legacy_hal.cpp
index 796098db2a..e3a34a93da 100644
--- a/wifi/aidl/default/wifi_legacy_hal.cpp
+++ b/wifi/aidl/default/wifi_legacy_hal.cpp
@@ -754,7 +754,7 @@ wifi_error WifiLegacyHal::disableLinkLayerStats(const std::string& iface_name) {
 
 // Copies wifi_peer_info* to vector<WifiPeerInfo> and returns poiner to next element.
 wifi_peer_info* WifiLegacyHal::copyPeerInfo(wifi_peer_info* peer_ptr,
-                                            std::vector<WifiPeerInfo> peers) {
+                                            std::vector<WifiPeerInfo>& peers) {
     WifiPeerInfo peer;
     peer.peer_info = *peer_ptr;
     if (peer_ptr->num_rate > 0) {
@@ -770,7 +770,7 @@ wifi_peer_info* WifiLegacyHal::copyPeerInfo(wifi_peer_info* peer_ptr,
 }
 // Copies wifi_link_stat* to vector<LinkStats> and returns poiner to next element.
 wifi_link_stat* WifiLegacyHal::copyLinkStat(wifi_link_stat* stat_ptr,
-                                            std::vector<LinkStats> stats) {
+                                            std::vector<LinkStats>& stats) {
     LinkStats linkStat;
     linkStat.stat = *stat_ptr;
     wifi_peer_info* l_peer_info_stats_ptr = stat_ptr->peer_info;
diff --git a/wifi/aidl/default/wifi_legacy_hal.h b/wifi/aidl/default/wifi_legacy_hal.h
index 85a8ac4fc3..f076ce6b6a 100644
--- a/wifi/aidl/default/wifi_legacy_hal.h
+++ b/wifi/aidl/default/wifi_legacy_hal.h
@@ -792,8 +792,8 @@ class WifiLegacyHal {
     // Handles wifi (error) status of Virtual interface create/delete
     wifi_error handleVirtualInterfaceCreateOrDeleteStatus(const std::string& ifname,
                                                           wifi_error status);
-    wifi_link_stat* copyLinkStat(wifi_link_stat* stat_ptr, std::vector<LinkStats> stats);
-    wifi_peer_info* copyPeerInfo(wifi_peer_info* peer_ptr, std::vector<WifiPeerInfo> peers);
+    wifi_link_stat* copyLinkStat(wifi_link_stat* stat_ptr, std::vector<LinkStats>& stats);
+    wifi_peer_info* copyPeerInfo(wifi_peer_info* peer_ptr, std::vector<WifiPeerInfo>& peers);
 
     // Global function table of legacy HAL.
     wifi_hal_fn global_func_table_;