diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 01c9a20..48596c6 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -51,8 +51,8 @@ IF(RELEASE_BUILD)
 ENDIF(RELEASE_BUILD)
 
 if( ${ARCHITECTURE} STREQUAL "x86_64" )
-  set(CMAKE_C_FLAGS   ${CMAKE_C_FLAGS}"-msse2" )
-  set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS}"-msse2" )
+  set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS}   -O3 -msse2")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3 -msse2")
 else()
   # Can set i686 / ARM stuff here
 endif()