diff --git a/impl/src/main.c b/impl/src/main.c
index 5b61f87..750cdf9 100644
--- a/impl/src/main.c
+++ b/impl/src/main.c
@@ -239,7 +239,7 @@ int main(int argc, char **argv)
 		}
 
 		// fill the TX queue from the TUN device
-		layer2_tx_fill_packet_queue(&l2tx);
+		RESULT_CHECK(layer2_tx_fill_packet_queue(&l2tx));
 
 		if((now > next_tx_switch_time) && (on_air || !layer1_rx_is_busy(&rx))) {
 			if(layer2_tx_can_transmit(&l2tx)) {