diff --git a/xmake/metax.lua b/xmake/metax.lua
index 432de74f7..e7071d4bb 100644
--- a/xmake/metax.lua
+++ b/xmake/metax.lua
@@ -53,6 +53,7 @@ target("infiniop-metax")
     add_files("../src/infiniop/ops/*/metax/*.maca", {rule = "maca"})
 
     if has_config("ninetoothed") then
+        add_includedirs(MACA_ROOT .. "/include/hcr")
         add_includedirs(MACA_ROOT .. "/include/mcr")
         add_files("../build/ninetoothed/*.c", "../build/ninetoothed/*.cpp", {
             cxflags = {