diff --git a/ml.cpp b/ml.cpp
index ed47495..c90b3d8 100644
--- a/ml.cpp
+++ b/ml.cpp
@@ -2289,6 +2289,7 @@ MlValue MlEnvironment::get(const std::string &name) const {
 // Get vector of executables in this scope
 std::vector<std::string> MlEnvironment::get_lambdas_list(const std::string &token) const {
 	std::vector<std::string> lambdas{};
+	lambdas.reserve(16);
 
 	for (auto it = defs.begin(); it != defs.end(); it++)
 		if (it->second.get_type_name() == FUNCTION_TYPE && (token.empty() || it->first.find(token) == 0))