diff --git a/migration/block.c b/migration/block.c
index 4b8576b8d6..273392be78 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -998,7 +998,7 @@ static int block_load(QEMUFile *f, void *opaque, int version_id)
                    (addr == 100) ? '\n' : '\r');
             fflush(stdout);
         } else if (!(flags & BLK_MIG_FLAG_EOS)) {
-            fprintf(stderr, "Unknown block migration flags: %#x\n", flags);
+            fprintf(stderr, "Unknown block migration flags: 0x%x\n", flags);
             return -EINVAL;
         }
         ret = qemu_file_get_error(f);
diff --git a/migration/ram.c b/migration/ram.c
index 433489d633..6ed4f9e507 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3298,7 +3298,7 @@ static int ram_load_postcopy(QEMUFile *f)
             multifd_recv_sync_main();
             break;
         default:
-            error_report("Unknown combination of migration flags: %#x"
+            error_report("Unknown combination of migration flags: 0x%x"
                          " (postcopy mode)", flags);
             ret = -EINVAL;
             break;
@@ -3576,7 +3576,7 @@ static int ram_load_precopy(QEMUFile *f)
             if (flags & RAM_SAVE_FLAG_HOOK) {
                 ram_control_load_hook(f, RAM_CONTROL_HOOK, NULL);
             } else {
-                error_report("Unknown combination of migration flags: %#x",
+                error_report("Unknown combination of migration flags: 0x%x",
                              flags);
                 ret = -EINVAL;
             }