diff --git a/drivers/staging/rtl8188eu/core/rtw_cmd.c b/drivers/staging/rtl8188eu/core/rtw_cmd.c
index 83a2e58aef53..7bd38b3745c9 100644
--- a/drivers/staging/rtl8188eu/core/rtw_cmd.c
+++ b/drivers/staging/rtl8188eu/core/rtw_cmd.c
@@ -405,10 +405,10 @@ u8 rtw_joinbss_cmd(struct adapter  *padapter, struct wlan_network *pnetwork)
 
 	psecuritypriv->authenticator_ie[0] = (unsigned char)psecnetwork->ie_length;
 
-	if ((psecnetwork->ie_length-12) < (256-1))
+	if ((psecnetwork->ie_length-12) < 255)
 		memcpy(&psecuritypriv->authenticator_ie[1], &psecnetwork->ies[12], psecnetwork->ie_length-12);
 	else
-		memcpy(&psecuritypriv->authenticator_ie[1], &psecnetwork->ies[12], (256-1));
+		memcpy(&psecuritypriv->authenticator_ie[1], &psecnetwork->ies[12], 255);
 
 	psecnetwork->ie_length = 0;
 	/*  Added by Albert 2009/02/18 */