diff --git a/src/gprs_rlcmac_ts_alloc.cpp b/src/gprs_rlcmac_ts_alloc.cpp
index d664bbc..d4cd984 100644
--- a/src/gprs_rlcmac_ts_alloc.cpp
+++ b/src/gprs_rlcmac_ts_alloc.cpp
@@ -456,6 +456,7 @@
 	ms_->set_reserved_slots(trx, 1 << ts, 1 << ts);
 
 	tbf_->upgrade_to_multislot = 0;
+	bts->bts->tbf_alloc_algo_a();
 	return 0;
 }
 
@@ -994,6 +995,8 @@
 		}
 	}
 
+	bts->bts->tbf_alloc_algo_b();
+
 	return 0;
 }