diff --git a/include/sqlgen/parsing/has_schema.hpp b/include/sqlgen/parsing/has_schema.hpp
index 34f99a4..e5eb24c 100644
--- a/include/sqlgen/parsing/has_schema.hpp
+++ b/include/sqlgen/parsing/has_schema.hpp
@@ -2,12 +2,13 @@
 #define SQLGEN_PARSING_HAS_SCHEMA_HPP_
 
 #include <concepts>
+#include <string>
 
 namespace sqlgen::parsing {
 
 template <typename T>
 concept has_schema = requires() {
-  { typename T::schema() } -> std::same_as<typename T::schema>;
+  { T::schema } -> std::convertible_to<std::string>;
 };
 
 }  // namespace sqlgen::parsing
diff --git a/include/sqlgen/parsing/has_tablename.hpp b/include/sqlgen/parsing/has_tablename.hpp
index 200679e..b378634 100644
--- a/include/sqlgen/parsing/has_tablename.hpp
+++ b/include/sqlgen/parsing/has_tablename.hpp
@@ -2,12 +2,13 @@
 #define SQLGEN_PARSING_HAS_TABLENAME_HPP_
 
 #include <concepts>
+#include <string>
 
 namespace sqlgen::parsing {
 
 template <typename T>
 concept has_tablename = requires() {
-  { typename T::tablename() } -> std::same_as<typename T::tablename>;
+  { T::tablename } -> std::convertible_to<std::string>;
 };
 
 }  // namespace sqlgen::parsing
diff --git a/tests/test_schema.cpp b/tests/test_schema.cpp
index 15e0bd1..276b19e 100644
--- a/tests/test_schema.cpp
+++ b/tests/test_schema.cpp
@@ -6,7 +6,7 @@
 namespace test_schema {
 
 struct TestTable {
-  using schema = sqlgen::Literal<"test">;
+  static constexpr const char* schema = "test";
 
   std::string field1;
   int32_t field2;
diff --git a/tests/test_tablename.cpp b/tests/test_tablename.cpp
index 36900c7..20b3218 100644
--- a/tests/test_tablename.cpp
+++ b/tests/test_tablename.cpp
@@ -6,7 +6,7 @@
 namespace test_tablename {
 
 struct TestTable {
-  using tablename = sqlgen::Literal<"TEST_TABLE">;
+  static constexpr const char* tablename = "TEST_TABLE";
 
   std::string field1;
   int32_t field2;