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-rw-r--r--block/null.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/null.c b/block/null.c
index b300390944..876f90965b 100644
--- a/block/null.c
+++ b/block/null.c
@@ -232,7 +232,7 @@ static void null_refresh_filename(BlockDriverState *bs, QDict *opts)
                  bs->drv->format_name);
     }
 
-    qdict_put(opts, "driver", qstring_from_str(bs->drv->format_name));
+    qdict_put_str(opts, "driver", bs->drv->format_name);
     bs->full_open_options = opts;
 }