1 files changed, 4 insertions, 4 deletions

diff --git a/src/lib/mysql/mysql_connection.h b/src/lib/mysql/mysql_connection.h
index c66da05dfa..5aefae8de4 100644
--- a/src/lib/mysql/mysql_connection.h
+++ b/src/lib/mysql/mysql_connection.h
@@ -450,7 +450,7 @@ public:
         checkUnusable();
         // Extract native input bindings.
         std::vector<MYSQL_BIND> in_bind_vec;
-        for (MySqlBindingPtr in_binding : in_bindings) {
+        for (const MySqlBindingPtr& in_binding : in_bindings) {
             in_bind_vec.push_back(in_binding->getMySqlBinding());
         }
 
@@ -464,7 +464,7 @@ public:
 
         // Bind variables that will receive results as well.
         std::vector<MYSQL_BIND> out_bind_vec;
-        for (MySqlBindingPtr out_binding : out_bindings) {
+        for (const MySqlBindingPtr& out_binding : out_bindings) {
             out_bind_vec.push_back(out_binding->getMySqlBinding());
         }
         if (!out_bind_vec.empty()) {
@@ -527,7 +527,7 @@ public:
                      const MySqlBindingCollection& in_bindings) {
         checkUnusable();
         std::vector<MYSQL_BIND> in_bind_vec;
-        for (MySqlBindingPtr in_binding : in_bindings) {
+        for (const MySqlBindingPtr& in_binding : in_bindings) {
             in_bind_vec.push_back(in_binding->getMySqlBinding());
         }
 
@@ -571,7 +571,7 @@ public:
                                const MySqlBindingCollection& in_bindings) {
         checkUnusable();
         std::vector<MYSQL_BIND> in_bind_vec;
-        for (MySqlBindingPtr in_binding : in_bindings) {
+        for (const MySqlBindingPtr& in_binding : in_bindings) {
             in_bind_vec.push_back(in_binding->getMySqlBinding());
         }