diff --git a/src/transport/multicast/tx.c b/src/transport/multicast/tx.c
index e3e0c9b71..3d5b18c0d 100644
--- a/src/transport/multicast/tx.c
+++ b/src/transport/multicast/tx.c
@@ -143,6 +143,9 @@ int8_t _z_multicast_send_n_msg(_z_session_t *zn, const _z_network_message_t *n_m
                         }
                     }
                 }
+
+                // Clear the buffer as it's no longer required
+                _z_wbuf_clear(&fbf);
             }
         }
 
diff --git a/src/transport/unicast/tx.c b/src/transport/unicast/tx.c
index 21694e1e9..f2ac6feee 100644
--- a/src/transport/unicast/tx.c
+++ b/src/transport/unicast/tx.c
@@ -152,6 +152,9 @@ int8_t _z_unicast_send_n_msg(_z_session_t *zn, const _z_network_message_t *n_msg
                         }
                     }
                 }
+
+                // Clear the buffer as it's no longer required
+                _z_wbuf_clear(&fbf);
             }
         }