diff --git a/drivers/ddr/altera/sdram.c b/drivers/ddr/altera/sdram.c
index 2996942..7e4606d 100644
--- a/drivers/ddr/altera/sdram.c
+++ b/drivers/ddr/altera/sdram.c
@@ -118,7 +118,7 @@
 
 	/* Obtain the address bits */
 	lo_addr_bits = prule->sdram_start >> 20ULL;
-	hi_addr_bits = prule->sdram_end >> 20ULL;
+	hi_addr_bits = (prule->sdram_end - 1) >> 20ULL;
 
 	debug("sdram set rule start %x, %d\n", lo_addr_bits,
 	      prule->sdram_start);