diff --git a/core/rtw_mp.c b/core/rtw_mp.c
index 564be07..949bcf0 100644
--- a/core/rtw_mp.c
+++ b/core/rtw_mp.c
@@ -2787,7 +2787,7 @@ void CRC16_generator(
 }
 
 
-
+#if !(defined(__arm__) || defined(__aarch64__)) && (LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0))
 /*========================================
 	SFD		SIGNAL	SERVICE	LENGTH	CRC
 	16 bit	8 bit	8 bit	16 bit	16 bit
@@ -2867,7 +2867,7 @@ void CCK_generator(
 	ByteToBit(pPMacTxInfo->CRC16, crc16_out, 2);
 
 }
-
+#endif
 
 void PMAC_Get_Pkt_Param(
 	PRT_PMAC_TX_INFO	pPMacTxInfo,
@@ -2940,7 +2940,7 @@ void PMAC_Get_Pkt_Param(
 		pPMacTxInfo->m_STBC = 1;
 }
 
-
+#if !(defined(__arm__) || defined(__aarch64__)) && (LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0))
 UINT LDPC_parameter_generator(
 	UINT N_pld_int,
 	UINT N_CBPSS,
@@ -3286,7 +3286,7 @@ void L_SIG_generator(
 	_rtw_memset(pPMacTxInfo->LSIG, 0, 3);
 	ByteToBit(pPMacTxInfo->LSIG, (bool *)sig_bi, 3);
 }
-
+#endif
 
 void CRC8_generator(
 	bool	*out,
diff --git a/dkms.conf b/dkms.conf
index 5c3322b..0f56eaf 100644
--- a/dkms.conf
+++ b/dkms.conf
@@ -1,5 +1,5 @@
 PACKAGE_NAME="realtek-rtl88xxau"
-PACKAGE_VERSION="5.2.20.2~20180812"
+PACKAGE_VERSION="5.2.20.2~20180826"
 CLEAN="'make' clean"
 BUILT_MODULE_NAME[0]=88XXau
 PROCS_NUM=`nproc`
diff --git a/include/rtw_mp.h b/include/rtw_mp.h
index d3805e9..2493e5c 100644
--- a/include/rtw_mp.h
+++ b/include/rtw_mp.h
@@ -761,6 +761,7 @@ PMAC_Get_Pkt_Param(
 	PRT_PMAC_TX_INFO	pPMacTxInfo,
 	PRT_PMAC_PKT_INFO	pPMacPktInfo
 );
+#if !(defined(__arm__) || defined(__aarch64__)) && (LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0))
 void
 CCK_generator(
 	PRT_PMAC_TX_INFO	pPMacTxInfo,
@@ -777,7 +778,7 @@ L_SIG_generator(
 	PRT_PMAC_TX_INFO	pPMacTxInfo,
 	PRT_PMAC_PKT_INFO	pPMacPktInfo
 );
-
+#endif
 void HT_SIG_generator(
 	PRT_PMAC_TX_INFO	pPMacTxInfo,
 	PRT_PMAC_PKT_INFO	pPMacPktInfo);
diff --git a/os_dep/linux/ioctl_mp.c b/os_dep/linux/ioctl_mp.c
index eacd685..4243633 100644
--- a/os_dep/linux/ioctl_mp.c
+++ b/os_dep/linux/ioctl_mp.c
@@ -1616,7 +1616,7 @@ int rtw_mp_tx(struct net_device *dev,
 			_rtw_memset(pMptCtx->PMacTxInfo.MacAddress, 0xFF, ETH_ALEN);
 
 			PMAC_Get_Pkt_Param(&pMptCtx->PMacTxInfo, &pMptCtx->PMacPktInfo);
-
+#if !(defined(__arm__) || defined(__aarch64__)) && (LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0))
 			if (MPT_IS_CCK_RATE(pMptCtx->PMacTxInfo.TX_RATE))
 
 				CCK_generator(&pMptCtx->PMacTxInfo, &pMptCtx->PMacPktInfo);
@@ -1625,6 +1625,7 @@ int rtw_mp_tx(struct net_device *dev,
 				/* 24 BIT*/
 				L_SIG_generator(pMptCtx->PMacPktInfo.N_sym, &pMptCtx->PMacTxInfo, &pMptCtx->PMacPktInfo);
 			}
+#endif
 			/*	48BIT*/
 			if (MPT_IS_HT_RATE(pMptCtx->PMacTxInfo.TX_RATE))
 				HT_SIG_generator(&pMptCtx->PMacTxInfo, &pMptCtx->PMacPktInfo);