diff --git a/src/stdafx.h b/src/stdafx.h
--- a/src/stdafx.h
+++ b/src/stdafx.h
@@ -298,21 +298,6 @@
 #endif
 #define PACK(type_dec) PACK_N(type_dec, 1)
 
-/* MSVCRT of course has to have a different syntax for long long *sigh* */
-#if defined(_MSC_VER)
-#   define OTTD_PRINTF64 "%I64d"
-#   define OTTD_PRINTF64U "%I64u"
-#   define OTTD_PRINTFHEX64 "%I64x"
-#elif defined(__MINGW32__)
-#   define OTTD_PRINTF64 "%I64d"
-#   define OTTD_PRINTF64U "%I64llu"
-#   define OTTD_PRINTFHEX64 "%I64x"
-#else
-#   define OTTD_PRINTF64 "%lld"
-#   define OTTD_PRINTF64U "%llu"
-#   define OTTD_PRINTFHEX64 "%llx"
-#endif
-
 /*
  * When making a (pure) debug build, the compiler will by default disable
  * inlining of functions. This has a detremental effect on the performance of
diff --git a/src/strings.cpp b/src/strings.cpp
--- a/src/strings.cpp
+++ b/src/strings.cpp
@@ -39,6 +39,7 @@
 #include "newgrf_engine.h"
 #include "core/backup_type.hpp"
 #include <stack>
+#include <charconv>
 
 #include "table/strings.h"
 #include "table/control_codes.h"
@@ -382,7 +383,7 @@ static char *FormatZerofillNumber(char *
 
 static char *FormatHexNumber(char *buff, uint64 number, const char *last)
 {
-	return buff + seprintf(buff, last, "0x" OTTD_PRINTFHEX64, number);
+	return strecpy(buff, fmt::format("0x{:X}", number).c_str(), last);
 }
 
 /**