diff --git a/include/fintamath/core/IMathObject.hpp b/include/fintamath/core/IMathObject.hpp
index 17ab94ecb..271c3befd 100644
--- a/include/fintamath/core/IMathObject.hpp
+++ b/include/fintamath/core/IMathObject.hpp
@@ -1,11 +1,14 @@
 #pragma once
 
 #include <concepts>
+#include <cstddef>
 #include <memory>
 #include <ostream>
 #include <string>
 #include <utility>
 
+#include <fmt/format.h>
+
 #include "fintamath/core/Converter.hpp"
 #include "fintamath/core/CoreUtils.hpp"
 #include "fintamath/core/MathObjectTypes.hpp"
@@ -24,7 +27,7 @@ class IMathObject {
   virtual std::unique_ptr<IMathObject> clone() && = 0;
 
   virtual std::string toString() const {
-    return typeid(*this).name();
+    return fmt::format("MathObject{}", static_cast<size_t>(getType()));
   }
 
   virtual std::unique_ptr<IMathObject> toMinimalObject() const {
diff --git a/tests/src/core/IMathObjectTests.cpp b/tests/src/core/IMathObjectTests.cpp
index 4345ce642..d8875f56a 100644
--- a/tests/src/core/IMathObjectTests.cpp
+++ b/tests/src/core/IMathObjectTests.cpp
@@ -10,12 +10,17 @@ using namespace fintamath;
 
 namespace {
 
-class TestMathObject final : public IMathObjectCRTP<TestMathObject> {};
+class TestMathObject final : public IMathObjectCRTP<TestMathObject> {
+public:
+  static constexpr MathObjectType getTypeStatic() {
+    return static_cast<size_t>(MathObjectType::IMathObject) + 999;
+  }
+};
 
 }
 
 TEST(IMathObjectTests, toStringTest) {
-  EXPECT_EQ(TestMathObject().toString(), typeid(TestMathObject).name());
+  EXPECT_EQ(TestMathObject().toString(), "MathObject999");
 }
 
 TEST(IMathObjectTests, cloneTest) {