diff --git a/CMakeLists.txt b/CMakeLists.txt
index ccffd8f58..8b2474401 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,6 +8,9 @@ set(CMAKE_OSX_DEPLOYMENT_TARGET 10.15 CACHE STRING "Minimum OS X deployment vers
 
 project(onnx_optimizer C CXX)
 
+set(CMAKE_CXX_VISIBILITY_PRESET "hidden")
+set(CMAKE_VISIBILITY_INLINES_HIDDEN TRUE)
+
 set(CMAKE_CXX_STANDARD 17)
 
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)