diff --git a/CMakeLists.txt b/CMakeLists.txt
index 83b7455..3ce1e49 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 CMAKE_MINIMUM_REQUIRED(VERSION 2.8.12)
 
-ADD_COMPILE_OPTIONS($<$<CXX_COMPILER_ID:MSVC>:/MP>)
+ADD_COMPILE_OPTIONS($<$<CXX_COMPILER_ID:MSVC>:/MP> $<$<CXX_COMPILER_ID:MSVC>:$<$<CONFIG:RELEASE>:/O2>> $<$<CXX_COMPILER_ID:MSVC>:$<$<CONFIG:RELWITHDEBINFO>:/O2>>)
 
 SET(PROJ_NAME githubpp)
 PROJECT(${PROJ_NAME})