diff --git a/qemu-img.c b/qemu-img.c
index babb5573ab..a5993682aa 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2146,7 +2146,7 @@ static void set_rate_limit(BlockBackend *blk, int64_t rate_limit)
 
 static int img_convert(int argc, char **argv)
 {
-    int c, bs_i, flags, src_flags = 0;
+    int c, bs_i, flags, src_flags = BDRV_O_NO_SHARE;
     const char *fmt = NULL, *out_fmt = NULL, *cache = "unsafe",
                *src_cache = BDRV_DEFAULT_CACHE, *out_baseimg = NULL,
                *out_filename, *out_baseimg_param, *snapshot_name = NULL;