diff --git a/arch/sim/src/sim/up_netdriver.c b/arch/sim/src/sim/up_netdriver.c
index 7697ce9579..93c294d5d1 100644
--- a/arch/sim/src/sim/up_netdriver.c
+++ b/arch/sim/src/sim/up_netdriver.c
@@ -72,6 +72,12 @@
 
 #include "up_internal.h"
 
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static void netdriver_txdone_interrupt(void *priv);
+
 /****************************************************************************
  * Private Data
  ****************************************************************************/
@@ -290,6 +296,17 @@ static int netdriver_txpoll(struct net_driver_s *dev)
           netdev_send(devidx, dev->d_buf, dev->d_len);
           NETDEV_TXDONE(dev);
         }
+      else
+        {
+          /* Calling txdone callback after loopback. NETDEV_TXDONE macro is
+           * already called in devif_loopback.
+           *
+           * TODO: Maybe a unified interface with txdone callback registered
+           * is needed, then we can let devif_loopback call this callback.
+           */
+
+          netdriver_txdone_interrupt(dev);
+        }
     }
 
   /* If zero is returned, the polling will continue until all connections