diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6899c34af..30e1c56a2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -65,6 +65,7 @@ if(CMAKE_COMPILER_IS_GNUCC)
 		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-unused-but-set-variable")
 	endif()
 	if(CMAKE_BUILD_TYPE STREQUAL "Release")
+		set(CMAKE_C_FLAGS_RELEASE "-DNDEBUG")
 		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2")
 	endif()
 	if(WITH_SSE2_TARGET)