diff --git a/include/rexy/compat/standard.hpp b/include/rexy/compat/standard.hpp
index 9f994fe..28ecba5 100644
--- a/include/rexy/compat/standard.hpp
+++ b/include/rexy/compat/standard.hpp
@@ -19,6 +19,8 @@
 #ifndef REXY_COMPAT_CPP20_HPP
 #define REXY_COMPAT_CPP20_HPP
 
+	#define REXY_REQUIRES_CPP20 static_assert(__cplusplus >= 202002L, "C++20 is required to use this file.")
+
 	#if __cplusplus >= 202002L
 		#define REXY_CPP20_CONSTEXPR constexpr
 		#define REXY_CPP20_CONSTEVAL consteval
diff --git a/include/rexy/format.hpp b/include/rexy/format.hpp
index a54deab..4eeb343 100644
--- a/include/rexy/format.hpp
+++ b/include/rexy/format.hpp
@@ -24,6 +24,8 @@
 
 #include "compat/standard.hpp"
 
+REXY_REQUIRES_CPP20;
+
 #ifndef REXY_STANDARD_CPP20
 	//Maybe I'll make it work someday, but not for now
 	#error "Cannot use formatting library without C++20 support"
diff --git a/include/rexy/format.tpp b/include/rexy/format.tpp
index f739fad..3033c81 100644
--- a/include/rexy/format.tpp
+++ b/include/rexy/format.tpp
@@ -19,6 +19,8 @@
 #ifndef REXY_FORMAT_TPP
 #define REXY_FORMAT_TPP
 
+REXY_REQUIRES_CPP20;
+
 #include "detail/format/format_args.tpp"
 #include "detail/format/formatter.tpp"
 #include "detail/format/storage.tpp"