diff --git a/qemu/accel/tcg/cputlb.c b/qemu/accel/tcg/cputlb.c
index 80e3d2e2..fa578962 100644
--- a/qemu/accel/tcg/cputlb.c
+++ b/qemu/accel/tcg/cputlb.c
@@ -605,8 +605,8 @@ static uint64_t io_readx(CPUArchState *env, CPUIOTLBEntry *iotlbentry,
     cpu->mem_io_vaddr = addr;
     cpu->mem_io_access_type = access_type;
 
-    r = memory_region_dispatch_read(mr, mr_offset,
-                                    &val, size, iotlbentry->attrs);
+    r = memory_region_dispatch_read(mr, mr_offset, &val, size_memop(size),
+                                    iotlbentry->attrs);
     if (r != MEMTX_OK) {
         hwaddr physaddr = mr_offset +
             section->offset_within_address_space -
@@ -636,8 +636,8 @@ static void io_writex(CPUArchState *env, CPUIOTLBEntry *iotlbentry,
     }
     cpu->mem_io_vaddr = addr;
     cpu->mem_io_pc = retaddr;
-    r = memory_region_dispatch_write(mr, mr_offset,
-                                     val, size, iotlbentry->attrs);
+    r = memory_region_dispatch_write(mr, mr_offset, val, size_memop(size),
+                                     iotlbentry->attrs);
     if (r != MEMTX_OK) {
         hwaddr physaddr = mr_offset +
             section->offset_within_address_space -