diff --git a/src/msw/stdpaths.cpp b/src/msw/stdpaths.cpp
index 27fa594c7e..d0271fe1e7 100644
--- a/src/msw/stdpaths.cpp
+++ b/src/msw/stdpaths.cpp
@@ -50,6 +50,10 @@ typedef HRESULT (WINAPI *SHGetSpecialFolderPath_t)(HWND, LPTSTR, int, BOOL);
 // used in our wxLogTrace messages
 static const wxChar *TRACE_MASK = _T("stdpaths");
 
+#ifndef CSIDL_APPDATA
+    #define CSIDL_APPDATA         0x001a
+#endif
+
 #ifndef CSIDL_LOCAL_APPDATA
     #define CSIDL_LOCAL_APPDATA   0x001c
 #endif