diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7e07a7c..c988400 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -51,9 +51,8 @@ target_link_libraries(camera_to_rtsp
 # 运行时把 config.json 复制到 bin/ 目录
 add_custom_command(
     TARGET camera_to_rtsp POST_BUILD
-    COMMAND ${CMAKE_COMMAND} -E echo "Checking config.json..."
-    COMMAND ${CMAKE_COMMAND} -E test -f $<TARGET_FILE_DIR:camera_to_rtsp>/config.json
-        || ${CMAKE_COMMAND} -E copy
-            ${CMAKE_SOURCE_DIR}/config.json
-            $<TARGET_FILE_DIR:camera_to_rtsp>/config.json
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        ${CMAKE_SOURCE_DIR}/config.json
+        $<TARGET_FILE_DIR:camera_to_rtsp>/config.json.default
 )
+
diff --git a/config.json b/config.json.default
similarity index 100%
rename from config.json
rename to config.json.default