diff --git a/CMakeLists.txt b/CMakeLists.txt
index e0d2e77..5ad9148 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,7 +15,7 @@ SET(BASE_CMAKE_LINK_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
 SET(CMAKE_EXE_LINKER_FLAGS "${BASE_CMAKE_LINK_FLAGS} -mthumb-interwork -mthumb -specs=gba.specs")
 
 SET(CMAKE_CXX_STANDARD 11)
-SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-narrowing")
+SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-narrowing -O3")
 set(CMAKE_VERBOSE_MAKEFILE on)
 
 project(gba-sprite-engine-project VERSION 0.1 LANGUAGES CXX)