diff --git a/migration/block.c b/migration/block.c
index 3499f75..a37678c 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -747,8 +747,7 @@
 static int block_save_iterate(QEMUFile *f, void *opaque)
 {
     int ret;
-    int64_t last_bytes = qemu_file_total_transferred(f);
-    int64_t delta_bytes;
+    uint64_t last_bytes = qemu_file_total_transferred(f);
 
     trace_migration_block_save("iterate", block_mig_state.submitted,
                                block_mig_state.transferred);
@@ -800,7 +799,7 @@
     }
 
     qemu_put_be64(f, BLK_MIG_FLAG_EOS);
-    delta_bytes = qemu_file_total_transferred(f) - last_bytes;
+    uint64_t delta_bytes = qemu_file_total_transferred(f) - last_bytes;
     return (delta_bytes > 0);
 }
 
diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index 11b510a..ccbefc3 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -51,7 +51,7 @@
     int64_t rate_limit_used;
 
     /* The sum of bytes transferred on the wire */
-    int64_t total_transferred;
+    uint64_t total_transferred;
 
     int buf_index;
     int buf_size; /* 0 when writing */
@@ -708,9 +708,9 @@
     return result;
 }
 
-int64_t qemu_file_total_transferred_fast(QEMUFile *f)
+uint64_t qemu_file_total_transferred_fast(QEMUFile *f)
 {
-    int64_t ret = f->total_transferred;
+    uint64_t ret = f->total_transferred;
     int i;
 
     for (i = 0; i < f->iovcnt; i++) {
@@ -720,7 +720,7 @@
     return ret;
 }
 
-int64_t qemu_file_total_transferred(QEMUFile *f)
+uint64_t qemu_file_total_transferred(QEMUFile *f)
 {
     qemu_fflush(f);
     return f->total_transferred;
diff --git a/migration/qemu-file.h b/migration/qemu-file.h
index d16cd50..4f26bf6 100644
--- a/migration/qemu-file.h
+++ b/migration/qemu-file.h
@@ -83,7 +83,7 @@
  *
  * Returns: the total bytes transferred
  */
-int64_t qemu_file_total_transferred(QEMUFile *f);
+uint64_t qemu_file_total_transferred(QEMUFile *f);
 
 /*
  * qemu_file_total_transferred_fast:
@@ -95,7 +95,7 @@
  *
  * Returns: the total bytes transferred and queued
  */
-int64_t qemu_file_total_transferred_fast(QEMUFile *f);
+uint64_t qemu_file_total_transferred_fast(QEMUFile *f);
 
 /*
  * put_buffer without copying the buffer.
diff --git a/migration/savevm.c b/migration/savevm.c
index a9d0a88..032044b 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -927,11 +927,9 @@
 static void vmstate_save_old_style(QEMUFile *f, SaveStateEntry *se,
                                    JSONWriter *vmdesc)
 {
-    int64_t old_offset, size;
-
-    old_offset = qemu_file_total_transferred_fast(f);
+    uint64_t old_offset = qemu_file_total_transferred_fast(f);
     se->ops->save_state(f, se->opaque);
-    size = qemu_file_total_transferred_fast(f) - old_offset;
+    uint64_t size = qemu_file_total_transferred_fast(f) - old_offset;
 
     if (vmdesc) {
         json_writer_int64(vmdesc, "size", size);
diff --git a/migration/vmstate.c b/migration/vmstate.c
index 83ca4c7..351f561 100644
--- a/migration/vmstate.c
+++ b/migration/vmstate.c
@@ -349,7 +349,7 @@
             void *first_elem = opaque + field->offset;
             int i, n_elems = vmstate_n_elems(opaque, field);
             int size = vmstate_size(opaque, field);
-            int64_t old_offset, written_bytes;
+            uint64_t old_offset, written_bytes;
             JSONWriter *vmdesc_loop = vmdesc;
 
             trace_vmstate_save_state_loop(vmsd->name, field->name, n_elems);