diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 1fb36a340468803237224c18012feaa6317af5aa..62df8e177585b9668629faacf3f5564a6b259990 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -293,6 +293,12 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
 	if (err)
 		goto remove;
 
+	/*
+	 * No support for high-speed yet, so just set
+	 * the card's maximum speed.
+	 */
+	mmc_set_clock(host, card->cis.max_dtr);
+
 	/*
 	 * Initialize (but don't add) all present functions.
 	 */