diff --git a/CMakeLists.txt b/CMakeLists.txt
index 96a3ea43e..52f51ba09 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.25)
 project(onnxruntime_extensions LANGUAGES C CXX)
 
 # set(CMAKE_VERBOSE_MAKEFILE ON)
-if(NOT CMAKE_BUILD_TYPE)
+if(NOT WIN32 AND NOT CMAKE_BUILD_TYPE)
   message(STATUS "Build type not set - using RelWithDebInfo")
   set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING "Choose build type: Debug Release RelWithDebInfo." FORCE)
 endif()
@@ -105,6 +105,11 @@ if(NOT CC_OPTIMIZE)
 endif()
 
 if (MSVC)
+  if (OCOS_ENABLE_STATIC_LIB) 
+    add_compile_options(/MT$<$<OR:$<CONFIG:Debug>,$<CONFIG:RelWithDebInfo>>:d>)
+    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<OR:$<CONFIG:Debug>,$<CONFIG:RelWithDebInfo>>:Debug>")
+  endif ()
+
   check_cxx_compiler_flag(-sdl HAS_SDL)
   check_cxx_compiler_flag(-Qspectre HAS_QSPECTRE)
   if (HAS_QSPECTRE)