diff --git a/lib/include/srslte/phy/rf/rf.h b/lib/include/srslte/phy/rf/rf.h
index bc74d17e7..42b2a691d 100644
--- a/lib/include/srslte/phy/rf/rf.h
+++ b/lib/include/srslte/phy/rf/rf.h
@@ -73,7 +73,12 @@ SRSLTE_API int srslte_rf_open(srslte_rf_t *h,
 
 SRSLTE_API int srslte_rf_open_multi(srslte_rf_t *h, 
                                     char *args, 
-                                    uint32_t nof_rx_antennas); 
+                                    uint32_t nof_rx_antennas);
+
+SRSLTE_API int srslte_rf_open_multi2(srslte_rf_t *h,
+                                     char *args,
+                                     uint32_t nof_tx_antennas,
+                                     uint32_t nof_rx_antennas);
 
 SRSLTE_API int srslte_rf_open_multi2(srslte_rf_t *h,
                                      char *args,