diff --git a/packages/addons/service/downloadmanager/transmission/source/bin/transmission.start b/packages/addons/service/downloadmanager/transmission/source/bin/transmission.start
index d024063421..455fbf7a5e 100755
--- a/packages/addons/service/downloadmanager/transmission/source/bin/transmission.start
+++ b/packages/addons/service/downloadmanager/transmission/source/bin/transmission.start
@@ -89,6 +89,11 @@ if [ ! "$(pidof transmission-daemon)" ];then
     if [ -f "$LOCKDIR/$LOCKFILE" ] ; then
       break
     fi
+    # XXX: sysctls for uTP. we may remove this later
+    if [ "$TRANSMISSION_UTP" = "true" ]; then
+      sysctl -w net.core.wmem_max=1048576 > /dev/null 2>&1
+      sysctl -w net.core.rmem_max=4194304 > /dev/null 2>&1
+    fi
     EVENT_NOEPOLL=1 LD_LIBRARY_PATH="$ADDON_DIR/lib:$LD_LIBRARY_PATH" eval transmission-daemon -f $TRANSMISSION_ARG &>$LOG_FILE
     sleep 1
   done &