diff --git a/arch/arm/src/arm/arm_cache.S b/arch/arm/src/arm/arm_cache.S
index a186f94354c..a5d9dc64811 100644
--- a/arch/arm/src/arm/arm_cache.S
+++ b/arch/arm/src/arm/arm_cache.S
@@ -199,7 +199,7 @@ up_clean_dcache:
 	.type	up_clean_dcache_all, function
 
 up_clean_dcache_all:
-	mrc		p15, 0, r0, c7, c10, 3
+	mrc		p15, 0, r15, c7, c10, 3
 	bne		up_clean_dcache_all
 	bx		lr
 	.size	up_clean_dcache_all, . - up_clean_dcache_all
@@ -227,7 +227,7 @@ up_flush_dcache:
 	.type	up_flush_dcache_all, function
 
 up_flush_dcache_all:
-	mrc		p15, 0, r0, c7, c14, 3
+	mrc		p15, 0, r15, c7, c14, 3
 	bne		up_flush_dcache_all
 	bx		lr
 	.size	up_flush_dcache_all, . - up_flush_dcache_all