diff --git a/CMakeLists.txt b/CMakeLists.txt
index 676aba4..d6944ab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ project(wxhelper VERSION 1.0.0)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED True)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /D '0_UNICODE' /D 'UNICODE'")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /D '_UNICODE' /D 'UNICODE'")
 
 file(GLOB CPP_FILES  ${PROJECT_SOURCE_DIR}/src/*.cc  ${PROJECT_SOURCE_DIR}/src/*.cpp)