diff --git a/cmake/kumir2/kumir2_apple.cmake b/cmake/kumir2/kumir2_apple.cmake
index e3ff6bcc725fdf3c17ec0a898564c662e06bffaf..7908dfe23f6c721f7ec5a9f6b4be30c99ddb03ba 100644
--- a/cmake/kumir2/kumir2_apple.cmake
+++ b/cmake/kumir2/kumir2_apple.cmake
@@ -24,7 +24,7 @@ set(KUMIR2_SDK_CMAKE_DIR "${KUMIR2_RESOURCES_DIR}/devel/cmake")
 
 # Compile flags
 set(KUMIR2_CXXFLAGS "-fno-exceptions -std=c++0x -fPIC -DAPPLE -Wall -Wno-inconsistent-missing-override -DQT_NO_DEPRECATED_WARNINGS")
-set(KUMIR2_CXXFLAGS_Release "-O2 -DNDEBUG -DQT_NO_DEBUG")
+set(KUMIR2_CXXFLAGS_Release "-O2 -UNDEBUG -UQT_NO_DEBUG")
 set(KUMIR2_CXXFLAGS_Debug "-g -O0 -Werror -Wreorder -Wreturn-type -Wno-error=unused-variable -Wno-error=unused-parameter")
 
 # Linkage flags