diff --git a/CMakeLists.txt b/CMakeLists.txt
index 48b77de..98383a9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,7 +33,7 @@ include(ConfigureChecks.cmake)
 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
 	# using Clang
 
-	set( CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -O3 -march=native -mtune=native -pedantic -stdlib=libc++")
+	set( CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -pedantic -stdlib=libc++")
 
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
 	# using G++
@@ -42,7 +42,7 @@ elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
 		message(FATAL_ERROR "G++ 5.1 or higher required")
 	endif()
 
-	set( CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -O3 -march=native -mtune=native -pedantic -Wno-variadic-macros" )
+	set( CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -pedantic -Wno-variadic-macros" )
 
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
 	# using Visual Studio