diff --git a/drivers/ddr/altera/sdram_soc64.c b/drivers/ddr/altera/sdram_soc64.c
index c8c9211..75c6de1 100644
--- a/drivers/ddr/altera/sdram_soc64.c
+++ b/drivers/ddr/altera/sdram_soc64.c
@@ -249,7 +249,7 @@
 			 DRAMADDRW_CFG_ROW_ADDR_WIDTH(dramaddrw) +
 			 DRAMADDRW_CFG_COL_ADDR_WIDTH(dramaddrw));
 
-	size *= (2 << (hmc_ecc_readl(plat, DDRIOCTRL) &
+	size *= ((phys_size_t)2 << (hmc_ecc_readl(plat, DDRIOCTRL) &
 			DDR_HMC_DDRIOCTRL_IOSIZE_MSK));
 
 	return size;