diff --git a/os/rpcauth.c b/os/rpcauth.c
index 9209021e0..c531a54e8 100644
--- a/os/rpcauth.c
+++ b/os/rpcauth.c
@@ -156,7 +156,7 @@ SecureRPCCheck(unsigned short data_length, const char *data,
 _X_HIDDEN void
 SecureRPCInit(void)
 {
-    if (rpc_id == ~0L)
+    if (rpc_id == (XID) ~0L)
         AddAuthorization(9, "SUN-DES-1", 0, (char *) 0);
 }