diff --git a/srsue/test/mac_test.cc b/srsue/test/mac_test.cc
index b3826ac58..7e328cbbc 100644
--- a/srsue/test/mac_test.cc
+++ b/srsue/test/mac_test.cc
@@ -328,7 +328,12 @@ public:
 
 class stack_dummy : public stack_interface_mac
 {
-  void process_pdus() final {}
+public:
+  void init(mac* mac_) { mac_h = mac_; }
+  void process_pdus() final { mac_h->process_pdus(); }
+
+private:
+  mac* mac_h = nullptr;
 };
 
 } // namespace srslte
@@ -370,6 +375,7 @@ int mac_unpack_test()
 
   // the actual MAC
   mac mac(&mac_log);
+  stack.init(&mac);
   mac.init(&phy, &rlc, &rrc, &timers, &stack);
 
   // create dummy DL action and grant and push MAC PDU
@@ -428,6 +434,7 @@ int mac_ul_sch_pdu_test1()
 
   // the actual MAC
   mac mac(&mac_log);
+  stack.init(&mac);
   mac.init(&phy, &rlc, &rrc, &timers, &stack);
   const uint16_t crnti = 0x1001;
   mac.set_ho_rnti(crnti, 0);
@@ -497,6 +504,7 @@ int mac_ul_logical_channel_prioritization_test1()
 
   // the actual MAC
   mac mac(&mac_log);
+  stack.init(&mac);
   mac.init(&phy, &rlc, &rrc, &timers, &stack);
   const uint16_t crnti = 0x1001;
   mac.set_ho_rnti(crnti, 0);
@@ -611,6 +619,7 @@ int mac_ul_logical_channel_prioritization_test2()
 
   // the actual MAC
   mac mac(&mac_log);
+  stack.init(&mac);
   mac.init(&phy, &rlc, &rrc, &timers, &stack);
   const uint16_t crnti = 0x1001;
   mac.set_ho_rnti(crnti, 0);
@@ -712,6 +721,7 @@ int mac_ul_logical_channel_prioritization_test3()
 
   // the actual MAC
   mac mac(&mac_log);
+  stack.init(&mac);
   mac.init(&phy, &rlc, &rrc, &timers, &stack);
   const uint16_t crnti = 0x1001;
   mac.set_ho_rnti(crnti, 0);
@@ -801,6 +811,7 @@ int mac_ul_sch_pdu_with_short_bsr_test()
 
   // the actual MAC
   mac mac(&mac_log);
+  stack.init(&mac);
   mac.init(&phy, &rlc, &rrc, &timers, &stack);
   const uint16_t crnti = 0x1001;
   mac.set_ho_rnti(crnti, 0);
@@ -888,6 +899,7 @@ int mac_ul_sch_pdu_with_padding_bsr_test()
 
   // the actual MAC
   mac mac(&mac_log);
+  stack.init(&mac);
   mac.init(&phy, &rlc, &rrc, &timers, &stack);
   const uint16_t crnti = 0x1001;
   mac.set_ho_rnti(crnti, 0);
@@ -984,6 +996,7 @@ int mac_ul_sch_pdu_one_byte_test()
 
   // the actual MAC
   mac mac(&mac_log);
+  stack.init(&mac);
   mac.init(&phy, &rlc, &rrc, &timers, &stack);
   const uint16_t crnti = 0x1001;
   mac.set_ho_rnti(crnti, 0);
@@ -1045,6 +1058,7 @@ int mac_ul_sch_pdu_two_byte_test()
 
   // the actual MAC
   mac mac(&mac_log);
+  stack.init(&mac);
   mac.init(&phy, &rlc, &rrc, &timers, &stack);
   const uint16_t crnti = 0x1001;
   mac.set_ho_rnti(crnti, 0);
@@ -1106,6 +1120,7 @@ int mac_ul_sch_pdu_three_byte_test()
 
   // the actual MAC
   mac mac(&mac_log);
+  stack.init(&mac);
   mac.init(&phy, &rlc, &rrc, &timers, &stack);
   const uint16_t crnti = 0x1001;
   mac.set_ho_rnti(crnti, 0);
@@ -1360,6 +1375,7 @@ int mac_random_access_test()
 
   // Configure MAC
   mac mac(&mac_log);
+  stack.init(&mac);
   mac.init(&phy, &rlc, &rrc, &timers, &stack);
   srslte::mac_cfg_t mac_cfg;
   set_mac_cfg_t_rach_cfg_common(&mac_cfg, rach_cfg);