diff --git a/include/dbus_monitor.hpp b/include/dbus_monitor.hpp
index 129422e..5f409d7 100644
--- a/include/dbus_monitor.hpp
+++ b/include/dbus_monitor.hpp
@@ -84,7 +84,7 @@
         }
 
         // data is type oa{sa{sv}} which is an array[2] of string, object
-        for (auto& entry : data[1].items())
+        for (const auto& entry : data[1].items())
         {
             auto it = thisSession->second.interfaces.find(entry.key());
             if (it != thisSession->second.interfaces.end())
diff --git a/include/openbmc_dbus_rest.hpp b/include/openbmc_dbus_rest.hpp
index d8a4e66..95503d7 100644
--- a/include/openbmc_dbus_rest.hpp
+++ b/include/openbmc_dbus_rest.hpp
@@ -1768,7 +1768,7 @@
                             }
                             else
                             {
-                                for (auto& prop : properties.items())
+                                for (const auto& prop : properties.items())
                                 {
                                     // if property name is empty, or
                                     // matches our search query, add it