diff --git a/src/os_win32.c b/src/os_win32.c
index 421a164..db3c794 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -142,6 +142,9 @@
 typedef int WCHAR;
 typedef void VOID;
 typedef int BY_HANDLE_FILE_INFORMATION;
+typedef int SE_OBJECT_TYPE;
+typedef int PSNSECINFO;
+typedef int PSNSECINFOW;
 #endif
 
 #ifndef FEAT_GUI_W32