diff --git a/sm4/asm_ppc64x.s b/sm4/asm_ppc64x.s
index c46efbe..1023e30 100644
--- a/sm4/asm_ppc64x.s
+++ b/sm4/asm_ppc64x.s
@@ -184,7 +184,7 @@ TEXT ·expandKeyAsm(SB),NOSPLIT,$0
 	VSLDOI $4, V2, V2, V3
 
 	VOR ESPERMW, ESPERMW, V5
-	SM4_BOX(V5, V6, V7)
+	SM4_SBOX(V5, V6, V7)
 	STXVW4X V5, (R5)
 
 /*