diff --git a/arch/arm/mach-imx/nand.c b/arch/arm/mach-imx/nand.c
index 01b8058..7c57ec4 100644
--- a/arch/arm/mach-imx/nand.c
+++ b/arch/arm/mach-imx/nand.c
@@ -72,7 +72,7 @@
 
 	switch (writesize) {
 	case 512:
-		fmcr &= FMCR_NF_FMS;
+		fmcr &= ~FMCR_NF_FMS;
 		break;
 	case 2048:
 		fmcr |= FMCR_NF_FMS;