diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index ac1b46cbd33e..7aa7b19d2c13 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -205,7 +205,7 @@ MODULE_PARM_DESC(bch,		 "Enable BCH ecc and set how many bits should "
 
 /* Calculate the page offset in flash RAM image by (row, column) address */
 #define NS_RAW_OFFSET(ns) \
-	(((ns)->regs.row << (ns)->geom.pgshift) + ((ns)->regs.row * (ns)->geom.oobsz) + (ns)->regs.column)
+	(((ns)->regs.row * (ns)->geom.pgszoob) + (ns)->regs.column)
 
 /* Calculate the OOB offset in flash RAM image by (row, column) address */
 #define NS_RAW_OFFSET_OOB(ns) (NS_RAW_OFFSET(ns) + ns->geom.pgsz)