diff --git a/CMakeLists.txt b/CMakeLists.txt
index e6b41d5..d72a5b9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -56,6 +56,9 @@ ADD_DEFINITIONS(-DNO_SPACE_NAVIGATOR_SUPPORT)
 SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -DSAXUM_DEBUG -g")
 SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS} -DSAXUM_DEBUG -g")
 
+SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -O2")
+SET(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS} -O2")
+
 set(dir ${CMAKE_CURRENT_SOURCE_DIR}/binaries)
 set(EXECUTABLE_OUTPUT_PATH ${dir} CACHE PATH "Build directory" FORCE)