diff --git a/constexpr/CMakeLists.txt b/constexpr/CMakeLists.txt
index 5a6eb4a..7ff4eea 100644
--- a/constexpr/CMakeLists.txt
+++ b/constexpr/CMakeLists.txt
@@ -1,7 +1,5 @@
 aux_source_directory(. SRC_LIST)
-add_definitions(-std=c++1z)
 #  -ftemplate-backtrace-limit=0
-#add_definitions(-std=c++1y)
 add_executable(constexpr_sudoku ${SRC_LIST})
 #target_link_libraries(constexpr_sudoku c++ c++abi)