diff --git a/tests/unit-tests/helper/ndn-link-control-helper.t.cpp b/tests/unit-tests/helper/ndn-link-control-helper.t.cpp
index 6abcf43..1e59f14 100644
--- a/tests/unit-tests/helper/ndn-link-control-helper.t.cpp
+++ b/tests/unit-tests/helper/ndn-link-control-helper.t.cpp
@@ -32,7 +32,7 @@
   // setting default parameters for PointToPoint links and channels
   Config::SetDefault("ns3::PointToPointNetDevice::DataRate", StringValue("10Mbps"));
   Config::SetDefault("ns3::PointToPointChannel::Delay", StringValue("10ms"));
-  Config::SetDefault("ns3::QueueBase::MaxPackets", UintegerValue(20));
+  Config::SetDefault("ns3::QueueBase::MaxSize", StringValue("20p"));
 
   createTopology({
       {"1", "2"},
@@ -77,7 +77,7 @@
   // setting default parameters for PointToPoint links and channels
   Config::SetDefault("ns3::PointToPointNetDevice::DataRate", StringValue("10Mbps"));
   Config::SetDefault("ns3::PointToPointChannel::Delay", StringValue("10ms"));
-  Config::SetDefault("ns3::QueueBase::MaxPackets", UintegerValue(20));
+  Config::SetDefault("ns3::QueueBase::MaxSize", StringValue("20p"));
 
   // Connecting nodes in 6 node topology:                        //
   //                                                             //
diff --git a/tests/unit-tests/helper/ndn-stack-helper.t.cpp b/tests/unit-tests/helper/ndn-stack-helper.t.cpp
index 04d5bba..2fc98b6 100644
--- a/tests/unit-tests/helper/ndn-stack-helper.t.cpp
+++ b/tests/unit-tests/helper/ndn-stack-helper.t.cpp
@@ -32,7 +32,7 @@
   // setting default parameters for PointToPoint links and channels
   Config::SetDefault("ns3::PointToPointNetDevice::DataRate", StringValue("10Mbps"));
   Config::SetDefault("ns3::PointToPointChannel::Delay", StringValue("10ms"));
-  Config::SetDefault("ns3::QueueBase::MaxPackets", UintegerValue(20));
+  Config::SetDefault("ns3::QueueBase::MaxSize", StringValue("20p"));
 
   // Creating nodes
   NodeContainer nodes;
diff --git a/tests/unit-tests/helper/ndn-strategy-choice-helper.t.cpp b/tests/unit-tests/helper/ndn-strategy-choice-helper.t.cpp
index e06a93d..a539141 100644
--- a/tests/unit-tests/helper/ndn-strategy-choice-helper.t.cpp
+++ b/tests/unit-tests/helper/ndn-strategy-choice-helper.t.cpp
@@ -33,7 +33,7 @@
   {
     Config::SetDefault("ns3::PointToPointNetDevice::DataRate", StringValue("10Mbps"));
     Config::SetDefault("ns3::PointToPointChannel::Delay", StringValue("1ms"));
-    Config::SetDefault("ns3::QueueBase::MaxPackets", UintegerValue(500));
+    Config::SetDefault("ns3::QueueBase::MaxSize", StringValue("500p"));
 
     // Creating two 3 node topologies:                      //
     //                                                      //