diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4cbfedf..1afaac1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -28,7 +28,7 @@ include_directories(
 
 if(UNIX)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-long-long -pedantic" )
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-long-long -pedantic -O3" )
 else()
 	add_definitions(
 		-D_CRT_SECURE_NO_WARNINGS