diff --git a/xmake.lua b/xmake.lua
index f84b8b6..d725d28 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -6,6 +6,7 @@ end
 if is_plat("mingw") then
 	add_cxxflags("-Wno-unused-variable -finput-charset=utf-8 -fexec-charset=gbk")
 end
+add_defines("FMT_HEADER_ONLY")
 add_includedirs("$(projectdir)/3rd", {public = true})
 add_includedirs("$(projectdir)/build", {public = true})
 includes("util", "ofen", "net", "server", "client", "filecomplete")