Error "passing const xxx as 'this' argument discards qualifiers" in C++: how to fix

error: passing 'const MyClass' as 'this' argument of 'bool MyClass::operator<(const MyClass&)' discards qualifiers [-fpermissive]

#include <iostream>
#include <set>

class MyClass {
public:
    MyClass(int val) : value(val) {}

    bool operator<(const MyClass& other) {
        return this->value < other.value;
    }

    int getValue() const { return value; }

private:
    int value;
};

int main() {
    std::set<MyClass> mySet;
    mySet.insert(MyClass(10));
    mySet.insert(MyClass(5));