diff --git a/drivers/net/mmnif.c b/drivers/net/mmnif.c
index 2884699e..e5a2bf2d 100644
--- a/drivers/net/mmnif.c
+++ b/drivers/net/mmnif.c
@@ -988,7 +988,6 @@ void mmnif_irqhandler()
 int mmnif_poll(void* e)
 {
         mmnif_t*     mmnif;
-        unsigned int diff = mmnif_timestamp();
 
         if (!mmnif_dev)
         {