diff --git a/hw/slavio_serial.c b/hw/slavio_serial.c
index 1028ed944c..71d6368a53 100644
--- a/hw/slavio_serial.c
+++ b/hw/slavio_serial.c
@@ -287,7 +287,7 @@ static void slavio_serial_reset_chn(ChannelState *s)
     int i;
 
     s->reg = 0;
-    for (i = 0; i < SERIAL_SIZE; i++) {
+    for (i = 0; i < SERIAL_REGS; i++) {
         s->rregs[i] = 0;
         s->wregs[i] = 0;
     }