diff --git a/rocclr/compiler/lib/loaders/elf/utils/libelf/CMakeLists.txt b/rocclr/compiler/lib/loaders/elf/utils/libelf/CMakeLists.txt
index 8a6d3e6ef1..d5460180e6 100644
--- a/rocclr/compiler/lib/loaders/elf/utils/libelf/CMakeLists.txt
+++ b/rocclr/compiler/lib/loaders/elf/utils/libelf/CMakeLists.txt
@@ -1,4 +1,4 @@
-set(CMAKE_CXX_FLAGS "-std=c++11")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 
 include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/../common)
diff --git a/rocclr/runtime/CMakeLists.txt b/rocclr/runtime/CMakeLists.txt
index b08d2fc835..69b1e70a84 100644
--- a/rocclr/runtime/CMakeLists.txt
+++ b/rocclr/runtime/CMakeLists.txt
@@ -1,4 +1,4 @@
-set(CMAKE_CXX_FLAGS "-std=c++11")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 
 option(GENERIC_IS_ZERO "Teach LLVM/Clang that generic address space IS address space 0 for AMDGPU target" OFF)
 if (GENERIC_IS_ZERO)