diff -Nur a/xbmc/utils/StringUtils.h b/xbmc/utils/StringUtils.h
--- a/xbmc/utils/StringUtils.h	2021-05-08 17:20:52.000000000 +0100
+++ b/xbmc/utils/StringUtils.h	2021-06-25 04:24:46.891420222 +0100
@@ -37,6 +37,10 @@
 #include <fmt/printf.h>
 #endif
 
+#if FMT_VERSION >= 80000
+#include <fmt/xchar.h>
+#endif
+
 #include "XBDateTime.h"
 #include "utils/params_check_macros.h"