diff --git a/hw/char/serial-mm.c b/hw/char/serial-mm.c
index 6e963e581f..0e0be26fa9 100644
--- a/hw/char/serial-mm.c
+++ b/hw/char/serial-mm.c
@@ -44,7 +44,7 @@ static void serial_mm_write(void *opaque, hwaddr addr,
     serial_io_ops.write(&s->serial, addr >> s->regshift, value, 1);
 }
 
-static const MemoryRegionOps serial_mm_ops[3] = {
+static const MemoryRegionOps serial_mm_ops[] = {
     [DEVICE_NATIVE_ENDIAN] = {
         .read = serial_mm_read,
         .write = serial_mm_write,