diff --git a/CMakeLists.txt b/CMakeLists.txt
index 42d3f2b..3d06c33 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@
 cmake_minimum_required(VERSION 3.15.2)
 project(python_interpreter)
 set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Ofast")
 
 include_directories(/usr/include/antlr4-runtime/)
 include_directories(