diff --git a/drivers/net/wireless/mwifiex/cfp.c b/drivers/net/wireless/mwifiex/cfp.c
index 3ddb8ec676ed..6dd331dfb517 100644
--- a/drivers/net/wireless/mwifiex/cfp.c
+++ b/drivers/net/wireless/mwifiex/cfp.c
@@ -533,5 +533,8 @@ u8 mwifiex_adjust_data_rate(struct mwifiex_private *priv,
 		rate_index = (rx_rate > MWIFIEX_RATE_INDEX_OFDM0) ?
 			      rx_rate - 1 : rx_rate;
 
+	if (rate_index >= MWIFIEX_MAX_AC_RX_RATES)
+		rate_index = MWIFIEX_MAX_AC_RX_RATES - 1;
+
 	return rate_index;
 }