diff --git a/overlay_experimental/overlay/steam_overlay.h b/overlay_experimental/overlay/steam_overlay.h
index 318a112f..00b132ce 100644
--- a/overlay_experimental/overlay/steam_overlay.h
+++ b/overlay_experimental/overlay/steam_overlay.h
@@ -253,7 +253,7 @@ public:
     void FriendConnect(Friend _friend);
     void FriendDisconnect(Friend _friend);
 
-    void AddAchievementNotification(std::string ach_name, nlohmann::json const& ach);
+    void AddAchievementNotification(const std::string &ach_name, nlohmann::json const& ach);
 };
 
 #else // EMU_OVERLAY
@@ -287,7 +287,7 @@ public:
     void FriendConnect(Friend _friend) {}
     void FriendDisconnect(Friend _friend) {}
 
-    void AddAchievementNotification(std::string ach_name, nlohmann::json const& ach) {}
+    void AddAchievementNotification(const std::string &ach_name, nlohmann::json const& ach) {}
 };
 
 #endif // EMU_OVERLAY
diff --git a/overlay_experimental/steam_overlay.cpp b/overlay_experimental/steam_overlay.cpp
index db3c21b8..542b8a74 100644
--- a/overlay_experimental/steam_overlay.cpp
+++ b/overlay_experimental/steam_overlay.cpp
@@ -1963,7 +1963,7 @@ void Steam_Overlay::FriendDisconnect(Friend _friend)
 }
 
 // show a notification when the user unlocks an achievement
-void Steam_Overlay::AddAchievementNotification(std::string ach_name, nlohmann::json const &ach)
+void Steam_Overlay::AddAchievementNotification(const std::string &ach_name, nlohmann::json const &ach)
 {
     PRINT_DEBUG_ENTRY();
     std::lock_guard<std::recursive_mutex> lock(overlay_mutex);