diff --git a/include/spdlog/fmt/fmt.h b/include/spdlog/fmt/fmt.h
index 7fa6b093..2f09c15e 100644
--- a/include/spdlog/fmt/fmt.h
+++ b/include/spdlog/fmt/fmt.h
@@ -27,4 +27,5 @@
 #else  // SPDLOG_FMT_EXTERNAL is defined - use external fmtlib
     #include <fmt/core.h>
     #include <fmt/format.h>
+    #include <fmt/xchar.h>
 #endif