diff --git a/CMakeLists.txt b/CMakeLists.txt
index d0a6d67..ce6953a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,7 +47,7 @@ else()
     if(CXXFLAGS)
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXXFLAGS}")
     else()
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -O3 -march=native")
     endif()
 endif()