diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 11f2cd5af7dc..9b65029dd2a3 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -1537,6 +1537,9 @@ _STATIC(__boot_from_prom)
 	mr	r28,r6
 	mr	r27,r7
 
+	/* Align the stack to 16-byte boundary for broken yaboot */
+	rldicr	r1,r1,0,59
+
 	/* Make sure we are running in 64 bits mode */
 	bl	.enable_64b_mode