diff --git a/CMakeLists.txt b/CMakeLists.txt
index cc976737cdce30e7b5a8a9ed433814dc9c18cfbe..aa939f41f7d6bce55fbb4229830abbe48f4b5f37 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -108,7 +108,7 @@ else()
 endif()
 
 if(CMAKE_BUILD_TYPE MATCHES Debug)
-	ADD_DEFINITIONS(-O0)
+	ADD_DEFINITIONS(-O3)
 	ADD_DEFINITIONS(-ggdb)
 	ADD_DEFINITIONS(-DDEBUG)
 	ADD_DEFINITIONS(-Wall)