diff --git a/src/btop_config.cpp b/src/btop_config.cpp
index 1647b21..55ef2ca 100644
--- a/src/btop_config.cpp
+++ b/src/btop_config.cpp
@@ -694,7 +694,8 @@ namespace Config {
 		std::ifstream cread(conf_file);
 		if (cread.good()) {
 			vector<string> valid_names;
-			for (auto &n : descriptions)
+			valid_names.reserve(descriptions.size());
+			for (const auto &n : descriptions)
 				valid_names.push_back(n[0]);
 			if (string v_string; cread.peek() != '#' or (getline(cread, v_string, '\n') and not s_contains(v_string, Global::Version)))
 				write_new = true;