diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b54d64..612d65b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,7 +13,7 @@ if(NOT CMAKE_BUILD_TYPE)
 	set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose the type of build." FORCE)
 endif()
 
-set(CMAKE_CXX_FLAGS_RELEASE "-O3 -Wall")
+set(CMAKE_CXX_FLAGS_RELEASE "-O3 -Wall -DNDEBUG")
 set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g2 -Wall")
 
 if(WIN32)