diff --git a/include/ntsecpkg.h b/include/ntsecpkg.h
index 0df345dbe36..937882641db 100644
--- a/include/ntsecpkg.h
+++ b/include/ntsecpkg.h
@@ -165,7 +165,7 @@ typedef VOID (NTAPI *PLSA_CALLBACK_FUNCTION)(ULONG_PTR, ULONG_PTR, PSecBuffer,
 
 /* misc typedefs used in the below prototypes */
 typedef PVOID *PLSA_CLIENT_REQUEST;
-typedef ULONG LSA_SEC_HANDLE, *PLSA_SEC_HANDLE;
+typedef ULONG_PTR LSA_SEC_HANDLE, *PLSA_SEC_HANDLE;
 typedef LPTHREAD_START_ROUTINE SEC_THREAD_START;
 typedef PSECURITY_ATTRIBUTES SEC_ATTRS;