diff --git a/makecopy b/makecopy
index bd4f517..252eb35 100755
--- a/makecopy
+++ b/makecopy
@@ -10,5 +10,5 @@ cp -rL $PROJECT_DIR/df_datalink_sp/src $DST_DIR/df_datalink_sp
 cp -rL $PROJECT_DIR/df_datalink_ge/src $DST_DIR/df_datalink_ge
 
 cd $DST_DIR/df_datalink_ge/networking/phy_layer
-sed -i "s/antConfig->rfTxMgc = 0;/antConfig->rfTxMgc = $GE_TXATT;/g" ./phy_antenna.c
-sed -i "s/antConfig->rcvMgc = 0;/antConfig->rcvMgc = $GE_RXATT;/g" ./phy_antenna.c
\ No newline at end of file
+sed -i'' -e "s/antConfig->rfTxMgc = 0;/antConfig->rfTxMgc = $GE_TXATT;/g" ./phy_antenna.c
+sed -i'' -e "s/antConfig->rcvMgc = 0;/antConfig->rcvMgc = $GE_RXATT;/g" ./phy_antenna.c
\ No newline at end of file