diff --git a/src/ext/CMakeLists.txt b/src/ext/CMakeLists.txt
index d90636a9..8197f0d3 100644
--- a/src/ext/CMakeLists.txt
+++ b/src/ext/CMakeLists.txt
@@ -80,7 +80,7 @@ add_subdirectory(EASTL)
 target_link_libraries(luisa-compute-ext PUBLIC EASTL)
 
 if (LUISA_COMPUTE_ENABLE_PYTHON)
-    add_subdirectory(pybind11)
+    find_package(pybind11 REQUIRED)
 endif ()
 
 if (LUISA_COMPUTE_ENABLE_ISPC OR LUISA_COMPUTE_ENABLE_LLVM)