diff --git a/include/fintamath/literals/Boolean.hpp b/include/fintamath/literals/Boolean.hpp
index 29e326726..43b4f6360 100644
--- a/include/fintamath/literals/Boolean.hpp
+++ b/include/fintamath/literals/Boolean.hpp
@@ -15,7 +15,9 @@ class Boolean final : public ILiteralCRTP<Boolean> {
 
   explicit Boolean(const std::string &str);
 
-  Boolean(bool val);
+  template <std::same_as<bool> Bool>
+  Boolean(const Bool val) : name(val ? trueStr : falseStr) {
+  }
 
   std::string toString() const override;
 
@@ -23,6 +25,10 @@ class Boolean final : public ILiteralCRTP<Boolean> {
 
 private:
   std::string name;
+
+  static constexpr std::string_view trueStr = "True";
+
+  static constexpr std::string_view falseStr = "False";
 };
 
 }
diff --git a/src/fintamath/literals/Boolean.cpp b/src/fintamath/literals/Boolean.cpp
index 9cd0772f3..eef68b3d7 100644
--- a/src/fintamath/literals/Boolean.cpp
+++ b/src/fintamath/literals/Boolean.cpp
@@ -4,9 +4,6 @@
 
 namespace fintamath {
 
-constexpr std::string_view trueStr = "True";
-constexpr std::string_view falseStr = "False";
-
 Boolean::Boolean() : name(falseStr) {
 }
 
@@ -18,9 +15,6 @@ Boolean::Boolean(const std::string &str) {
   name = str;
 }
 
-Boolean::Boolean(const bool val) : name(val ? trueStr : falseStr) {
-}
-
 std::string Boolean::toString() const {
   return name;
 }
diff --git a/tests/src/literals/BooleanTests.cpp b/tests/src/literals/BooleanTests.cpp
index c869ef12e..a4151328a 100644
--- a/tests/src/literals/BooleanTests.cpp
+++ b/tests/src/literals/BooleanTests.cpp
@@ -11,15 +11,15 @@ TEST(BooleanTests, constructorTest) {
 }
 
 TEST(BooleanTests, stringConstructorTest) {
-  EXPECT_EQ(Boolean(std::string("True")), true);
-  EXPECT_EQ(Boolean(std::string("False")), false);
-
-  EXPECT_THROW(Boolean(std::string("true")), InvalidInputException);
-  EXPECT_THROW(Boolean(std::string("false")), InvalidInputException);
-  EXPECT_THROW(Boolean(std::string("10")), InvalidInputException);
-  EXPECT_THROW(Boolean(std::string("i")), InvalidInputException);
-  EXPECT_THROW(Boolean(std::string("")), InvalidInputException);
-  EXPECT_THROW(Boolean(std::string("")), InvalidInputException);
+  EXPECT_EQ(Boolean("True"), true);
+  EXPECT_EQ(Boolean("False"), false);
+
+  EXPECT_THROW(Boolean("true"), InvalidInputException);
+  EXPECT_THROW(Boolean("false"), InvalidInputException);
+  EXPECT_THROW(Boolean("10"), InvalidInputException);
+  EXPECT_THROW(Boolean("i"), InvalidInputException);
+  EXPECT_THROW(Boolean(""), InvalidInputException);
+  EXPECT_THROW(Boolean(""), InvalidInputException);
 }
 
 TEST(BooleanTests, boolConstructorTest) {
@@ -45,6 +45,6 @@ TEST(BooleanTests, opearatorsTest) {
 }
 
 TEST(BooleanTest, getClassTest) {
-  EXPECT_EQ(Boolean::getClassStatic(), MathObjectClass("Boolean"));
-  EXPECT_EQ(Boolean::getClassStatic().getParent(), ILiteral::getClassStatic());
+  EXPECT_EQ(Boolean().getClass(), MathObjectClass("Boolean"));
+  EXPECT_EQ(Boolean().getClass().getParent(), ILiteral::getClassStatic());
 }