diff --git a/ubb-la/ubb-la.c b/ubb-la/ubb-la.c
index f94cb93..2bf259b 100644
--- a/ubb-la/ubb-la.c
+++ b/ubb-la/ubb-la.c
@@ -335,7 +335,7 @@ static void frequency(struct mmcclk *clk, int hz)
 {
 	struct mmcclk mmc;
 
-	mmcclk_first(&mmc, 0);
+	mmcclk_first(&mmc, 0, MMCCLK_FLAG_RD_ONLY);
 	*clk = mmc;
 	while (mmcclk_next(&mmc))
 		if (fabs(clk->bus_clk_hz-hz) > fabs(mmc.bus_clk_hz-hz) ||