diff --git a/indra/newview/llfloaterchatmentionpicker.cpp b/indra/newview/llfloaterchatmentionpicker.cpp
index 44f1112dbe..d30e533062 100644
--- a/indra/newview/llfloaterchatmentionpicker.cpp
+++ b/indra/newview/llfloaterchatmentionpicker.cpp
@@ -187,10 +187,10 @@ void LLFloaterChatMentionPicker::updateSessionID(LLUUID session_id)
     // </FS:Ansariel> [FS communication UI]
 }
 
-void LLFloaterChatMentionPicker::updateAvatarList(uuid_vec_t& avatar_ids)
+void LLFloaterChatMentionPicker::updateAvatarList(const uuid_vec_t& avatar_ids)
 {
     std::vector<std::string> av_names;
-    for (auto& id : avatar_ids)
+    for (const auto& id : avatar_ids)
     {
         LLAvatarName av_name;
         LLAvatarNameCache::get(id, &av_name);
diff --git a/indra/newview/llfloaterchatmentionpicker.h b/indra/newview/llfloaterchatmentionpicker.h
index 2801ef3ac6..e63e4e4d21 100644
--- a/indra/newview/llfloaterchatmentionpicker.h
+++ b/indra/newview/llfloaterchatmentionpicker.h
@@ -43,7 +43,7 @@ public:
 
     static uuid_vec_t getParticipantIds();
     static void updateSessionID(LLUUID session_id);
-    static void updateAvatarList(uuid_vec_t& avatar_ids);
+    static void updateAvatarList(const uuid_vec_t& avatar_ids);
 
     // <FS:Ansariel> [FS communication UI]
     static void updateParticipantSource(FSChatParticipants* source);