diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9a799d2e..ce7d08fe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -185,8 +185,8 @@ if(GCC)
         endif()
     endif()
 
-    #set(CMAKE_C_VISIBILITY_PRESET hidden)
-    #set(CMAKE_CXX_VISIBILITY_PRESET hidden)
+    set(CMAKE_C_VISIBILITY_PRESET hidden)
+    set(CMAKE_CXX_VISIBILITY_PRESET hidden)
 
     # disable multichar warning
     add_definitions(-Wno-multichar)