diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index 144d10ddde..fa1daa6dd3 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -1,3 +1,8 @@
+cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+
+if (NOT TARGET AvogadroCore)
+  find_package(AvogadroLibs REQUIRED)
+endif()
 find_package(PythonInterp 3 REQUIRED)
 find_package(PythonLibs 3 REQUIRED)
 set(PYBIND11_PYTHON_VERSION "3" CACHE STRING "")