diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 9e07bd038dda..1a3607b96635 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -489,6 +489,7 @@ _GLOBAL(copy_and_flush)
 	sync
 	addi	r5,r5,8
 	addi	r6,r6,8
+	isync
 	blr
 
 .align 8