diff --git a/drivers/net/mmnif.c b/drivers/net/mmnif.c
index 6ec0fa3b..a8d47d15 100644
--- a/drivers/net/mmnif.c
+++ b/drivers/net/mmnif.c
@@ -1094,9 +1094,9 @@ static int mmnif_wait(struct netif* netif, uint32_t poll, int budget)
 				mmnif_lock_rx_hdr(own_ip_address && 0xff);
 				mmnif->rx_buff->iv_intr = FALSE;
 				mmnif_unlock_rx_hdr(own_ip_address && 0xff);
-
-				DEBUGPRINTF("\nPOLLING ENABLED\n");
-
+#ifdef DEBUG_MMNIF
+				DEBUGPRINTF("mmnif_wait(): heuristical polling enables\n");
+#endif
 				sem_post(&mmnif->com_poll);
 				mmnif->stats.bdg_overflow = 0;
 		 }
@@ -1192,16 +1192,13 @@ int mmnif_poll(void* e)
 			/*   enable interrupts and suspend polling
 			 * 
 			 */
-//				sem_wait(&mmnif->com_poll);
-
 				mmnif_lock_rx_hdr(own_ip_address && 0xff);
 				mmnif->rx_buff->iv_intr = TRUE;
 				mmnif_unlock_rx_hdr(own_ip_address && 0xff);
-
-				DEBUGPRINTF("\nINTERRUPTS ENABLED\n");
-
+#ifdef DEBUG_MMNIF
+				DEBUGPRINTF("mmnif_poll(): heuristical interrupts enabled\n");
+#endif
 				sem_wait(&mmnif->com_poll);
-
 				mmnif->stats.pll_empty = 1;
 			}
 		}