diff --git a/arch/ppc/qemu/start.S b/arch/ppc/qemu/start.S
index 3ee59d7..443d668 100644
--- a/arch/ppc/qemu/start.S
+++ b/arch/ppc/qemu/start.S
@@ -268,10 +268,13 @@ GLOBL(__vectors_end):
 /************************************************************************/
 
 GLOBL(_entry):
+
+#ifndef __powerpc64__
 	/* clear MSR, disable MMU */
 
 	li	r0,0
 	mtmsr	r0
+#endif
 
 	/* copy exception vectors */