diff --git a/CMakeLists.txt b/CMakeLists.txt
index e940893..7751426 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -36,7 +36,6 @@ set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 option(XGBOOSTER_BUILD_TESTS "Build tests" ON)
 option(XGBOOSTER_BUILD_APPS "Build applications" ON)
 option(XGBOOSTER_SERIALIZE_WITH_CEREAL "Serialize w/ cereal" ON) # hunter update
-option(XGBOOSTER_ADD_TO_STRING "Add local to_string definitions" OFF) # for android
 option(XGBOOSTER_DO_LEAN "Build for prediction only (size reduction)" OFF) 
 
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