diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5f5e581f..c9cfa323 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -88,7 +88,7 @@ elseif(UNIX)
 		set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -ggdb")
 
 		if ("${CMAKE_BUILD_TYPE}" STREQUAL "Release")
-			set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -flto=thin")
+			set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -flto")
 		endif()
 	elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
 		# O3 and Ofast include one or more flags that cause java to crash when using gcc6
@@ -104,7 +104,7 @@ elseif(UNIX)
 		-Wno-write-strings -Wno-unknown-pragmas \
 		-Wno-uninitialized -Wno-reorder")
 
-	add_definitions(-DLINUX -D_REENTRANT -Dlinux -D_USING_STL -D_GNU_SOURCE -D_XOPEN_SOURCE=500)
+	add_definitions(-DLINUX -D_REENTRANT -Dlinux -D_USING_STL -D_GNU_SOURCE -D_XOPEN_SOURCE=500 -U_FORTIFY_SOURCE)
 endif()
 
 add_subdirectory(external)