diff --git a/CHANGES.html b/CHANGES.html
index 4e901fded..799e31dfa 100644
--- a/CHANGES.html
+++ b/CHANGES.html
@@ -187,6 +187,8 @@ is now exported by WifiNetDevice.</li>
 <li>Queue discs that can operate both in packet mode and byte mode (Red, CoDel, Pie) define their own
     enum QueueDiscMode instead of using QueueBase::QueueMode.
 </li>
+<li>The CoDel, PIE and RED queue discs require that the size of the internal queue is the same as
+    the queue disc limit (previously, it was allowed to be greater than or equal).
 </li>
   <li> The default value of the <b>EnableBeaconJitter</b> attribute in ApWifiMac was changed from false to true.
   </li>
diff --git a/examples/traffic-control/traffic-control.cc b/examples/traffic-control/traffic-control.cc
index 7a0fd1168..5042b977e 100644
--- a/examples/traffic-control/traffic-control.cc
+++ b/examples/traffic-control/traffic-control.cc
@@ -119,9 +119,7 @@ main (int argc, char *argv[])
   stack.Install (nodes);
 
   TrafficControlHelper tch;
-  uint16_t handle = tch.SetRootQueueDisc ("ns3::RedQueueDisc");
-  // Add the internal queue used by Red
-  tch.AddInternalQueues (handle, 1, "ns3::DropTailQueue", "MaxPackets", UintegerValue (10000));
+  tch.SetRootQueueDisc ("ns3::RedQueueDisc");
   QueueDiscContainer qdiscs = tch.Install (devices);
 
   Ptr<QueueDisc> q = qdiscs.Get (1);
diff --git a/src/traffic-control/model/codel-queue-disc.cc b/src/traffic-control/model/codel-queue-disc.cc
index 257fdd6a8..f151c9f8d 100644
--- a/src/traffic-control/model/codel-queue-disc.cc
+++ b/src/traffic-control/model/codel-queue-disc.cc
@@ -528,10 +528,10 @@ CoDelQueueDisc::CheckConfig (void)
       return false;
     }
 
-  if ((m_mode ==  QUEUE_DISC_MODE_PACKETS && GetInternalQueue (0)->GetMaxPackets () < m_maxPackets) ||
-      (m_mode ==  QUEUE_DISC_MODE_BYTES && GetInternalQueue (0)->GetMaxBytes () < m_maxBytes))
+  if ((m_mode ==  QUEUE_DISC_MODE_PACKETS && GetInternalQueue (0)->GetMaxPackets () != m_maxPackets) ||
+      (m_mode ==  QUEUE_DISC_MODE_BYTES && GetInternalQueue (0)->GetMaxBytes () != m_maxBytes))
     {
-      NS_LOG_ERROR ("The size of the internal queue is less than the queue disc limit");
+      NS_LOG_ERROR ("The size of the internal queue differs from the queue disc limit");
       return false;
     }
 
diff --git a/src/traffic-control/model/pie-queue-disc.cc b/src/traffic-control/model/pie-queue-disc.cc
index 4bffd3318..dc4a067fe 100644
--- a/src/traffic-control/model/pie-queue-disc.cc
+++ b/src/traffic-control/model/pie-queue-disc.cc
@@ -524,10 +524,10 @@ PieQueueDisc::CheckConfig (void)
       return false;
     }
 
-  if ((m_mode ==  QUEUE_DISC_MODE_PACKETS && GetInternalQueue (0)->GetMaxPackets () < m_queueLimit)
-      || (m_mode ==  QUEUE_DISC_MODE_BYTES && GetInternalQueue (0)->GetMaxBytes () < m_queueLimit))
+  if ((m_mode ==  QUEUE_DISC_MODE_PACKETS && GetInternalQueue (0)->GetMaxPackets () != m_queueLimit)
+      || (m_mode ==  QUEUE_DISC_MODE_BYTES && GetInternalQueue (0)->GetMaxBytes () != m_queueLimit))
     {
-      NS_LOG_ERROR ("The size of the internal queue is less than the queue disc limit");
+      NS_LOG_ERROR ("The size of the internal queue differs from the queue disc limit");
       return false;
     }
 
diff --git a/src/traffic-control/model/red-queue-disc.cc b/src/traffic-control/model/red-queue-disc.cc
index 49791b8e5..c31a7f4d8 100644
--- a/src/traffic-control/model/red-queue-disc.cc
+++ b/src/traffic-control/model/red-queue-disc.cc
@@ -973,10 +973,10 @@ RedQueueDisc::CheckConfig (void)
       return false;
     }
 
-  if ((m_mode ==  QUEUE_DISC_MODE_PACKETS && GetInternalQueue (0)->GetMaxPackets () < m_queueLimit) ||
-      (m_mode ==  QUEUE_DISC_MODE_BYTES && GetInternalQueue (0)->GetMaxBytes () < m_queueLimit))
+  if ((m_mode ==  QUEUE_DISC_MODE_PACKETS && GetInternalQueue (0)->GetMaxPackets () != m_queueLimit) ||
+      (m_mode ==  QUEUE_DISC_MODE_BYTES && GetInternalQueue (0)->GetMaxBytes () != m_queueLimit))
     {
-      NS_LOG_ERROR ("The size of the internal queue is less than the queue disc limit");
+      NS_LOG_ERROR ("The size of the internal queue differs from the queue disc limit");
       return false;
     }