diff --git a/driver/xpu/xpu.c b/driver/xpu/xpu.c
index ae4c779..87463f0 100644
--- a/driver/xpu/xpu.c
+++ b/driver/xpu/xpu.c
@@ -435,8 +435,8 @@ static inline u32 hw_init(enum xpu_mode mode){
 
 	xpu_api->XPU_REG_SEND_ACK_WAIT_TOP_write( ((16+23)<<16)|(0+23) );
 
-	xpu_api->XPU_REG_RECV_ACK_COUNT_TOP0_write( (((45+2+2)*10 + 15)<<16) | 10 );//2.4GHz. extra 300 clocks are needed when rx core fall into fake ht detection phase (rx mcs 6M)
-	xpu_api->XPU_REG_RECV_ACK_COUNT_TOP1_write( (((51+2+2)*10 + 15)<<16) | 10 );//5GHz. extra 300 clocks are needed when rx core fall into fake ht detection phase (rx mcs 6M)
+	xpu_api->XPU_REG_RECV_ACK_COUNT_TOP0_write( (1<<31) | (((45+2+2)*10 + 15)<<16) | 10 );//2.4GHz. extra 300 clocks are needed when rx core fall into fake ht detection phase (rx mcs 6M)
+	xpu_api->XPU_REG_RECV_ACK_COUNT_TOP1_write( (1<<31) | (((51+2+2)*10 + 15)<<16) | 10 );//5GHz. extra 300 clocks are needed when rx core fall into fake ht detection phase (rx mcs 6M)
 
 	xpu_api->XPU_REG_DIFS_ADVANCE_write((OPENWIFI_MAX_SIGNAL_LEN_TH<<16)|2); //us. bit31~16 max pkt length threshold