diff --git a/cmd/ztest/ztest.c b/cmd/ztest/ztest.c
index 1f5afe4af..70a3e206f 100644
--- a/cmd/ztest/ztest.c
+++ b/cmd/ztest/ztest.c
@@ -5838,7 +5838,7 @@ ztest_run_zdb(char *pool)
 	ztest_get_zdb_bin(bin, len);
 
 	(void) sprintf(zdb,
-	    "%s -bcc%s%s -d -U %s %s",
+	    "%s -bcc%s%s -G -d -U %s %s",
 	    bin,
 	    ztest_opts.zo_verbose >= 3 ? "s" : "",
 	    ztest_opts.zo_verbose >= 4 ? "v" : "",