diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index 5d08514f553c8155d9325f3e567a1e939b5b7d8b..556e8131ecdcd68c9a685e5f5bea5f036d839222 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -586,7 +586,8 @@ static int init_nandsim(struct mtd_info *mtd)
 	if (ns->busw == 16)
 		NS_WARN("16-bit flashes support wasn't tested\n");
 
-	printk("flash size: %llu MiB\n",        ns->geom.totsz >> 20);
+	printk("flash size: %llu MiB\n",
+			(unsigned long long)ns->geom.totsz >> 20);
 	printk("page size: %u bytes\n",         ns->geom.pgsz);
 	printk("OOB area size: %u bytes\n",     ns->geom.oobsz);
 	printk("sector size: %u KiB\n",         ns->geom.secsz >> 10);
@@ -595,8 +596,9 @@ static int init_nandsim(struct mtd_info *mtd)
 	printk("bus width: %u\n",               ns->busw);
 	printk("bits in sector size: %u\n",     ns->geom.secshift);
 	printk("bits in page size: %u\n",       ns->geom.pgshift);
-	printk("bits in OOB size: %u\n",        ns->geom.oobshift);
-	printk("flash size with OOB: %llu KiB\n", ns->geom.totszoob >> 10);
+	printk("bits in OOB size: %u\n",	ns->geom.oobshift);
+	printk("flash size with OOB: %llu KiB\n",
+			(unsigned long long)ns->geom.totszoob >> 10);
 	printk("page address bytes: %u\n",      ns->geom.pgaddrbytes);
 	printk("sector address bytes: %u\n",    ns->geom.secaddrbytes);
 	printk("options: %#x\n",                ns->options);