diff --git a/CMakeLists.txt b/CMakeLists.txt
index f3266509..21302434 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -132,6 +132,8 @@ endif()
 
 
 if(IS_PYTHON_BUILD)
+
+    find_package(pybind11 REQUIRED)
     list(APPEND EXT_INCLUDE_DIRS
             ${pybind11_INCLUDE_DIR}
     )