diff --git a/compiler-rt/cmake/Modules/CompilerRTUtils.cmake b/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
index e4e3cfb9a2d9..7c0fe6023132 100644
--- a/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
+++ b/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
@@ -487,6 +487,8 @@ function(filter_builtin_sources inout_var name)
         if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/${_cname}")
           message(STATUS "For ${name} builtins preferring ${_file} to ${_cname}")
           list(REMOVE_ITEM intermediate ${_cname})
+          string(REGEX REPLACE "\\.c$" ".cpp" _cppname "${_cname}")
+          list(REMOVE_ITEM intermediate ${_cppname})
         endif()
       endforeach()
     endif()