diff --git a/drivers/mtd/tests/pagetest.c b/drivers/mtd/tests/pagetest.c
index ed2d3f6..88296e8 100644
--- a/drivers/mtd/tests/pagetest.c
+++ b/drivers/mtd/tests/pagetest.c
@@ -52,7 +52,7 @@
 
 static int write_eraseblock(int ebnum)
 {
-	loff_t addr = ebnum * mtd->erasesize;
+	loff_t addr = (loff_t)ebnum * mtd->erasesize;
 
 	prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
 	cond_resched();
@@ -64,7 +64,7 @@
 	uint32_t j;
 	int err = 0, i;
 	loff_t addr0, addrn;
-	loff_t addr = ebnum * mtd->erasesize;
+	loff_t addr = (loff_t)ebnum * mtd->erasesize;
 
 	addr0 = 0;
 	for (i = 0; i < ebcnt && bbt[i]; ++i)