diff --git a/hw/xbox/nvnet.c b/hw/xbox/nvnet.c
index 824d114da7..7a246857d6 100644
--- a/hw/xbox/nvnet.c
+++ b/hw/xbox/nvnet.c
@@ -415,6 +415,7 @@ static uint32_t nvnet_get_reg(NvNetState *s, hwaddr addr, unsigned int size)
 
     default:
         assert(0); /* Unsupported register access. */
+        return 0;
     }
 }