diff --git a/CMakeLists.txt b/CMakeLists.txt
index a28edb7..08b663c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,8 +25,8 @@ if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE Release)
 endif()
 
-set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -Wall")
-set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3")
+set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -U_FORTIFY_SOURCE -Wall")
+set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -U_FORTIFY_SOURCE -O3")
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
   set(extra-libs "stdc++fs")