diff --git a/cmake/Hardening.cmake b/cmake/Hardening.cmake
index 5f61d22..0517e2d 100644
--- a/cmake/Hardening.cmake
+++ b/cmake/Hardening.cmake
@@ -17,7 +17,9 @@ macro(
     set(NEW_CXX_DEFINITIONS "${NEW_CXX_DEFINITIONS} -D_GLIBCXX_ASSERTIONS")
     message(STATUS "*** GLIBC++ Assertions (vector[], string[], ...) enabled")
 
-    set(NEW_COMPILE_OPTIONS "${NEW_COMPILE_OPTIONS} -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3")
+    if(NOT CMAKE_BUILD_TYPE MATCHES "Debug")
+      set(NEW_COMPILE_OPTIONS "${NEW_COMPILE_OPTIONS} -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3")
+    endif()
     message(STATUS "*** g++/clang _FORTIFY_SOURCE=3 enabled")
 
     #    check_cxx_compiler_flag(-fpie PIE)