diff --git a/ChangeLog b/ChangeLog
index 6ab09c760f..a674d064f5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5610,3 +5610,7 @@
 	  needed to be flushed to data cache; Fix another where a virual address
 	  was being used in a register where a physical address was required
 	  (2013-9-20).
+	* arch/arm/src/armv7-a/cp15_clean_dcache.S and cp15_flush_dcache.S:
+	  fix an error in the alignment of addresses to cache line boundaries
+	  (2013-9-21).
+
diff --git a/arch/arm/src/armv7-a/cp15_clean_dcache.S b/arch/arm/src/armv7-a/cp15_clean_dcache.S
index fdc7513ede..6a244dac9e 100755
--- a/arch/arm/src/armv7-a/cp15_clean_dcache.S
+++ b/arch/arm/src/armv7-a/cp15_clean_dcache.S
@@ -99,7 +99,7 @@ cp15_clean_dcache:
 	mov		r2, r2, lsl r3			/* Get the cache line size in bytes */
 
 	sub		r3, r2, #1				/* R3=Cache line size mask */
-	bic		r12, r0, r3				/* R12=aligned start address */
+	bic		r0, r0, r3				/* R0=aligned start address */
 
 	/* Loop, cleaning each cache line by writing its contents to memory */
 
diff --git a/arch/arm/src/armv7-a/cp15_flush_dcache.S b/arch/arm/src/armv7-a/cp15_flush_dcache.S
index 2e21db5981..ba5b753bad 100755
--- a/arch/arm/src/armv7-a/cp15_flush_dcache.S
+++ b/arch/arm/src/armv7-a/cp15_flush_dcache.S
@@ -99,7 +99,7 @@ cp15_flush_dcache:
 	mov		r2, r2, lsl r3			/* Get the cache line size in bytes */
 
 	sub		r3, r2, #1				/* R3=Cache line size mask */
-	bic		r12, r0, r3				/* R12=aligned start address */
+	bic		r0, r0, r3				/* R0=aligned start address */
 
 	/* Loop, cleaning and invaliding each D cache line in the address range */