diff --git a/srsue/src/stack/mac_nr/mac_nr.cc b/srsue/src/stack/mac_nr/mac_nr.cc
index 7143e0052..8290ec158 100644
--- a/srsue/src/stack/mac_nr/mac_nr.cc
+++ b/srsue/src/stack/mac_nr/mac_nr.cc
@@ -66,6 +66,8 @@ void mac_nr::stop()
   if (started) {
     started = false;
   }
+
+  srslte_softbuffer_tx_free(&softbuffer_tx);
 }
 
 // Implement Section 5.9