diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index cd23cf8a2fcd0a..056566defd877a 100644
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -16,6 +16,9 @@ if(NOT LLVM_NO_INSTALL_NAME_DIR_FOR_BUILD_TREE)
   set(CMAKE_BUILD_WITH_INSTALL_NAME_DIR ON)
 endif()
 
+if(MSVC)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_SILENCE_NONFLOATING_COMPLEX_DEPRECATION_WARNING" CACHE INTERNAL "")
+endif()
 if(NOT DEFINED LLVM_VERSION_MAJOR)
   set(LLVM_VERSION_MAJOR 19)
 endif()