diff --git a/zuc/eia_asm_ppc64x.s b/zuc/eia_asm_ppc64x.s
index a485b15..9112d36 100644
--- a/zuc/eia_asm_ppc64x.s
+++ b/zuc/eia_asm_ppc64x.s
@@ -56,7 +56,7 @@ TEXT ·eia3Round16B(SB),NOSPLIT,$0
 	LXVD2X (PTR)(R0), BIT_REV_AND_TAB
 	VAND	BIT_REV_AND_TAB, XDATA, XTMP3
 	VSPLTISB $4, XTMP2;
-	VSRW	XDATA, XTMP2, XTMP1
+	VSRB	XDATA, XTMP2, XTMP1
 	VAND	BIT_REV_AND_TAB, XTMP1, XTMP1
 
 	MOVD	$0x10, R8