diff --git a/cmake/onnxruntime_providers_xnnpack.cmake b/cmake/onnxruntime_providers_xnnpack.cmake
index 9c00703ca0846..1b04639965852 100644
--- a/cmake/onnxruntime_providers_xnnpack.cmake
+++ b/cmake/onnxruntime_providers_xnnpack.cmake
@@ -19,6 +19,9 @@
     flatbuffers::flatbuffers Boost::mp11 safeint_interface
   )
 
+  # Add compile option to suppress stringop-overflow error in Flatbuffers.
+  target_compile_options(onnxruntime_providers_xnnpack PRIVATE -Wno-error=stringop-overflow)
+
   add_dependencies(onnxruntime_providers_xnnpack onnx ${onnxruntime_EXTERNAL_DEPENDENCIES})
   set_target_properties(onnxruntime_providers_xnnpack PROPERTIES FOLDER "ONNXRuntime")
 
diff --git a/cmake/patches/flatbuffers/flatbuffers.patch b/cmake/patches/flatbuffers/flatbuffers.patch
index fb2678ef1bdce..f141d358c54b6 100644
--- a/cmake/patches/flatbuffers/flatbuffers.patch
+++ b/cmake/patches/flatbuffers/flatbuffers.patch
@@ -7,7 +7,7 @@ index 3987eac9..5e5462f1 100644
    endif(CYGWIN)
    set(CMAKE_CXX_FLAGS
 -    "${CMAKE_CXX_FLAGS} -Wall -pedantic -Werror -Wextra -Werror=shadow")
-+    "${CMAKE_CXX_FLAGS} -Wall -pedantic -Werror -Wextra -Werror=shadow -Wno-error=stringop-overflow")
++    "${CMAKE_CXX_FLAGS} -Wall -pedantic -Wextra -Werror=shadow -Wno-error=stringop-overflow")
    set(FLATBUFFERS_PRIVATE_CXX_FLAGS "-Wold-style-cast")
    if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4.4)
      if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 7.0)