diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index ddb84b70..14d3de18 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 2.8)
 
 project(external LANGUAGES C CXX)