diff --git a/hw/isa/lpc_ich9.c b/hw/isa/lpc_ich9.c
index 1fba3c210ca..c9442ebc6f1 100644
--- a/hw/isa/lpc_ich9.c
+++ b/hw/isa/lpc_ich9.c
@@ -508,7 +508,7 @@ static void ich9_lpc_rcba_update(ICH9LPCState *lpc, uint32_t rcba_old)
     if (rcba_old & ICH9_LPC_RCBA_EN) {
         memory_region_del_subregion(get_system_memory(), &lpc->rcrb_mem);
     }
-    if (rcba & ICH9_LPC_RCBA_EN) {
+    if (rcba & ICH9_LPC_RCBA_EN && !lpc->rcrb_mem.container) {
         memory_region_add_subregion_overlap(get_system_memory(),
                                             rcba & ICH9_LPC_RCBA_BA_MASK,
                                             &lpc->rcrb_mem, 1);