diff --git a/CMakeLists.txt b/CMakeLists.txt
index 84208222..11a3a122 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -62,7 +62,7 @@ ENDIF( NOT VERSION )
 IF(CMAKE_BUILD_TYPE STREQUAL "Debug")
     ADD_DEFINITIONS(-DDEBUG)
 ELSE()
-    ADD_DEFINITIONS(-NDEBUG)
+    ADD_DEFINITIONS(-DNDEBUG)
 ENDIF()
 
 # Fill in SDLMAIN_LIBRARY on OS X manually to avoid using SDLMain.m