diff --git a/lldb/CMakeLists.txt b/lldb/CMakeLists.txt
index abebb6d35aac8..71298d76ed4d6 100644
--- a/lldb/CMakeLists.txt
+++ b/lldb/CMakeLists.txt
@@ -54,9 +54,10 @@ include(LLDBLayeringCheck)
 # BEGIN - Swift Mods
 if (LLDB_ENABLE_SWIFT_SUPPORT)
   if(EXISTS "${LLVM_EXTERNAL_SWIFT_SOURCE_DIR}")
+     cmake_path(CONVERT "${LLVM_EXTERNAL_SWIFT_SOURCE_DIR}" TO_CMAKE_PATH_LIST NORMALIZED_LLVM_EXTERNAL_SWIFT_SOURCE_DIR NORMALIZE)
      list(APPEND CMAKE_MODULE_PATH
-          "${LLVM_EXTERNAL_SWIFT_SOURCE_DIR}/cmake"
-          "${LLVM_EXTERNAL_SWIFT_SOURCE_DIR}/cmake/modules")
+          "${NORMALIZED_LLVM_EXTERNAL_SWIFT_SOURCE_DIR}/cmake"
+          "${NORMALIZED_LLVM_EXTERNAL_SWIFT_SOURCE_DIR}/cmake/modules")
   elseif(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/../swift)
      list(APPEND CMAKE_MODULE_PATH
           "${CMAKE_CURRENT_SOURCE_DIR}/../swift/cmake"