diff --git a/server/gameserver/CMakeLists.txt b/server/gameserver/CMakeLists.txt
index 0ea2d53..5521fda 100644
--- a/server/gameserver/CMakeLists.txt
+++ b/server/gameserver/CMakeLists.txt
@@ -10,7 +10,7 @@ else()
   set(CMAKE_BUILD_TYPE "Debug")
   message("debug mode")
 endif()
-set(CMAKE_CXX_FLAGS_RELEASE "-O3 -Wall -g -std=gnu++11 -DGAME_ID=${GAME_ID}")
+set(CMAKE_CXX_FLAGS_RELEASE "-O3 -Wall -g -std=gnu++11 -DGAME_ID=${GAME_ID} -DNDEBUG")
 set(CMAKE_CXX_FLAGS_DEBUG "-Wall -g -std=gnu++11 -DGAME_ID=${GAME_ID} -DDEBUG")
 
 include_directories(