diff --git a/Modules/Compiler/IntelLLVM.cmake b/Modules/Compiler/IntelLLVM.cmake
index 43eb13a005..14b7ad83c7 100644
--- a/Modules/Compiler/IntelLLVM.cmake
+++ b/Modules/Compiler/IntelLLVM.cmake
@@ -18,7 +18,6 @@ set(__pch_header_OBJCXX "objective-c++-header")
 if(CMAKE_HOST_WIN32)
   # MSVC-like
   macro(__compiler_intel_llvm lang)
-    set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-imsvc ")
     if(NOT "x${lang}" STREQUAL "xFortran")
       set(CMAKE_${lang}_COMPILE_OPTIONS_INVALID_PCH -Winvalid-pch)
     endif()