diff --git a/drivers/mmc/pxamci.c b/drivers/mmc/pxamci.c
index 6073d99..9fc9aed 100644
--- a/drivers/mmc/pxamci.c
+++ b/drivers/mmc/pxamci.c
@@ -450,6 +450,11 @@
 	 */
 	mmc->max_seg_size = PAGE_SIZE;
 
+	/*
+	 * Block length register is 10 bits.
+	 */
+	mmc->max_blk_size = 1023;
+
 	host = mmc_priv(mmc);
 	host->mmc = mmc;
 	host->dma = -1;