1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index 6d5444b58e6c..c70c677b3f73 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -280,7 +280,7 @@ static void rt2500usb_config_type(struct rt2x00_dev *rt2x00dev, const int type,
          */
         rt2500usb_register_read(rt2x00dev, TXRX_CSR20, &reg);
         rt2x00_set_field16(&reg, TXRX_CSR20_OFFSET,
-                           (PREAMBLE + get_duration(IEEE80211_HEADER, 2)) >> 6);
+                           (PREAMBLE + get_duration(IEEE80211_HEADER, 20)) >> 6);
         if (type == IEEE80211_IF_TYPE_STA)
                 rt2x00_set_field16(&reg, TXRX_CSR20_BCN_EXPECT_WINDOW, 0);
         else