diff --git a/unit_tests/CMakeLists.txt b/unit_tests/CMakeLists.txt
index 424712e761..f420bb8cc7 100644
--- a/unit_tests/CMakeLists.txt
+++ b/unit_tests/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2017-2019 Intel Corporation
+# Copyright (C) 2017-2020 Intel Corporation
 #
 # SPDX-License-Identifier: MIT
 #
@@ -13,6 +13,7 @@ set(PLATFORM_SPECIFIC_TARGETS_FOLDER "${TEST_PROJECTS_FOLDER}/test platforms")
 if(UNIX)
   string(REPLACE "-O2" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
   #disable fortify source as this requires optimization to be on
+  string(REPLACE "-Wp,-D_FORTIFY_SOURCE=2" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
   string(REPLACE "-D_FORTIFY_SOURCE=2" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
   set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O0")
   set(CMAKE_CXX_FLAGS_RELEASEINTERNAL "${CMAKE_CXX_FLAGS_RELEASEINTERNAL} -O0")