diff --git a/components/fx/lexer.cpp b/components/fx/lexer.cpp
index e2759e7af0..07d7f060a4 100644
--- a/components/fx/lexer.cpp
+++ b/components/fx/lexer.cpp
@@ -1,9 +1,14 @@
 #include "lexer.hpp"
 
 #include <cctype>
-#include <charconv>
 #include <format>
 
+#ifndef __cpp_lib_to_chars
+#include <cstdlib>
+#else
+#include <charconv>
+#endif
+
 namespace Fx
 {
     namespace Lexer
@@ -289,8 +294,14 @@ namespace Fx
         Token Lexer::scanNumber()
         {
             double buffer;
+#ifndef __cpp_lib_to_chars
+            char* endPtr = nullptr;
+            buffer = std::strtod(mHead, &endPtr);
+            if (endPtr == nullptr || endPtr == mHead)
+#else
             const auto [endPtr, ec] = std::from_chars(mHead, mTail, buffer);
             if (ec != std::errc())
+#endif
                 error("critical error while parsing number");
 
             std::string_view literal(mHead, endPtr);