diff --git a/common.cmake b/common.cmake
index 146532041..f7634f394 100644
--- a/common.cmake
+++ b/common.cmake
@@ -10,7 +10,9 @@ target_include_directories(${PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
 # Compile option
 if(MSVC)
   target_compile_options(${PROJECT_NAME} PUBLIC "/W4")
-  target_compile_options(${PROJECT_NAME} PUBLIC "/MT")
+  if(NOT USE_HILS) # /MT option conflicts /clr option in the HILS config.
+    target_compile_options(${PROJECT_NAME} PUBLIC "/MT")
+  endif()
   target_compile_options(${PROJECT_NAME} PUBLIC "/source-charset:utf-8")
 else()
   target_compile_options(${PROJECT_NAME} PUBLIC "-Wall")