2 files changed, 2 insertions, 2 deletions
diff --git a/Source/Particles/Collision/BackgroundMCCCollision.cpp b/Source/Particles/Collision/BackgroundMCCCollision.cpp
index b051f8e22..7086ae80f 100644
--- a/Source/Particles/Collision/BackgroundMCCCollision.cpp
+++ b/Source/Particles/Collision/BackgroundMCCCollision.cpp
@@ -44,7 +44,7 @@ BackgroundMCCCollision::BackgroundMCCCollision (std::string const collision_name
 
     // create a vector of MCCProcess objects from each scattering
     // process name
-    for (auto scattering_process : scattering_process_names) {
+    for (const auto& scattering_process : scattering_process_names) {
         std::string kw_cross_section = scattering_process + "_cross_section";
         std::string cross_section_file;
         pp_collision_name.query(kw_cross_section.c_str(), cross_section_file);
diff --git a/Source/Utils/MsgLogger/MsgLogger.cpp b/Source/Utils/MsgLogger/MsgLogger.cpp
index 0120fb2b4..f5d4fcb45 100644
--- a/Source/Utils/MsgLogger/MsgLogger.cpp
+++ b/Source/Utils/MsgLogger/MsgLogger.cpp
@@ -621,7 +621,7 @@ std::vector<char> serialize_msgs(
     const auto how_many = static_cast<int> (msgs.size());
     put_in (how_many, serialized);
 
-    for (auto msg : msgs){
+    for (const auto& msg : msgs){
         put_in_vec(msg.serialize(), serialized);
     }
     return serialized;