diff --git a/common/cmd_nand.c b/common/cmd_nand.c
index 3d434e8..aedf8a6 100644
--- a/common/cmd_nand.c
+++ b/common/cmd_nand.c
@@ -160,7 +160,7 @@
 	if (*size == nand->size)
 		puts("whole chip\n");
 	else
-		printf("offset 0x%lx, size 0x%x\n", *off, *size);
+		printf("offset 0x%lx, size 0x%zx\n", *off, *size);
 	return 0;
 }
 
@@ -398,7 +398,7 @@
 			return 1;
 		}
 
-		printf(" %d bytes %s: %s\n", size,
+		printf(" %zu bytes %s: %s\n", size,
 		       read ? "read" : "written", ret ? "ERROR" : "OK");
 
 		return ret == 0 ? 0 : 1;