diff --git a/CMakeLists.txt b/CMakeLists.txt
index ac610cd9d5..252807ff4c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,4 @@
-#cmake_minimum_required(VERSION 2.8.3)
-cmake_minimum_required(VERSION 3.9)
+cmake_minimum_required(VERSION 2.8.3)
 project(modular_convolution)
 
 #c++