diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 517e0e18f0b8..844a75a30572 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -701,8 +701,8 @@ __setup_mmu:	sub	r3, r4, #16384		@ Page directory size
  * bits for the RAM area only.
  */
 		mov	r0, r3
-		mov	r9, r0, lsr #18
-		mov	r9, r9, lsl #18		@ start of RAM
+		mov	r9, r0, lsr #20
+		mov	r9, r9, lsl #20		@ start of RAM
 		add	r10, r9, #0x10000000	@ a reasonable RAM size
 		mov	r1, #0x12		@ XN|U + section mapping
 		orr	r1, r1, #3 << 10	@ AP=11