diff --git a/CMakeLists.txt b/CMakeLists.txt
index ba2c37f..bd7f268 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -96,7 +96,7 @@ option(PYBUILD "Build Python modules")
 
 # Third tier: Python modules.
 if(PYBUILD)
-  add_subdirectory(pybind11)
+  find_package(pybind11)
 
   file(GLOB LAYOUT_SOURCES "src/python/*.cpp")
   pybind11_add_module(_ext ${LAYOUT_SOURCES})