diff --git a/stdlib/public/Platform/winsdk_shared.modulemap b/stdlib/public/Platform/winsdk_shared.modulemap
index 598373d6b32e5..244460b92040b 100644
--- a/stdlib/public/Platform/winsdk_shared.modulemap
+++ b/stdlib/public/Platform/winsdk_shared.modulemap
@@ -10,7 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-module _GUID {
+module _GUIDDef {
   header "guiddef.h"
   export *
 }
diff --git a/stdlib/public/Windows/WinSDK.swift b/stdlib/public/Windows/WinSDK.swift
index f2055d013c6a3..cfa0f2fdee6b5 100644
--- a/stdlib/public/Windows/WinSDK.swift
+++ b/stdlib/public/Windows/WinSDK.swift
@@ -11,7 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 @_exported import ucrt
-@_exported import _GUID
+@_exported import _GUIDDef
 @_exported import WinSDK // Clang module
 
 // WinBase.h