diff --git a/lld/CMakeLists.txt b/lld/CMakeLists.txt
--- a/lld/CMakeLists.txt
+++ b/lld/CMakeLists.txt
@@ -35,6 +35,7 @@
   set(LLVM_MAIN_SRC_DIR ${MAIN_SRC_DIR} CACHE PATH "Path to LLVM source tree")
 
   file(TO_CMAKE_PATH ${LLVM_OBJ_ROOT} LLVM_BINARY_DIR)
+  file(TO_CMAKE_PATH ${LLVM_CMAKE_PATH} LLVM_CMAKE_PATH)
 
   if(NOT EXISTS "${LLVM_CMAKE_PATH}/LLVMConfig.cmake")
     message(FATAL_ERROR "LLVMConfig.cmake not found")