diff --git a/src/internet/model/tcp-newreno.cc b/src/internet/model/tcp-newreno.cc
index c750424d2..d7eb61e7c 100644
--- a/src/internet/model/tcp-newreno.cc
+++ b/src/internet/model/tcp-newreno.cc
@@ -55,7 +55,10 @@ TcpNewReno::GetTypeId (void)
   return tid;
 }
 
-TcpNewReno::TcpNewReno (void) : m_inFastRec (false)
+TcpNewReno::TcpNewReno (void)
+  : m_retxThresh (3), // mute valgrind, actual value set by the attribute system
+    m_inFastRec (false),
+    m_limitedTx (false) // mute valgrind, actual value set by the attribute system
 {
   NS_LOG_FUNCTION (this);
 }
@@ -65,7 +68,9 @@ TcpNewReno::TcpNewReno (const TcpNewReno& sock)
     m_cWnd (sock.m_cWnd),
     m_ssThresh (sock.m_ssThresh),
     m_initialCWnd (sock.m_initialCWnd),
-    m_inFastRec (false)
+    m_retxThresh (sock.m_retxThresh),
+    m_inFastRec (false),
+    m_limitedTx (sock.m_limitedTx)
 {
   NS_LOG_FUNCTION (this);
   NS_LOG_LOGIC ("Invoked the copy constructor");
diff --git a/src/internet/model/tcp-reno.cc b/src/internet/model/tcp-reno.cc
index 2104900e5..7fb55f724 100644
--- a/src/internet/model/tcp-reno.cc
+++ b/src/internet/model/tcp-reno.cc
@@ -51,7 +51,7 @@ TcpReno::GetTypeId (void)
   return tid;
 }
 
-TcpReno::TcpReno (void) : m_inFastRec (false)
+TcpReno::TcpReno (void) : m_retxThresh (3), m_inFastRec (false)
 {
   NS_LOG_FUNCTION (this);
 }
@@ -61,6 +61,7 @@ TcpReno::TcpReno (const TcpReno& sock)
     m_cWnd (sock.m_cWnd),
     m_ssThresh (sock.m_ssThresh),
     m_initialCWnd (sock.m_initialCWnd),
+    m_retxThresh (sock.m_retxThresh),
     m_inFastRec (false)
 {
   NS_LOG_FUNCTION (this);
diff --git a/src/internet/model/tcp-tahoe.cc b/src/internet/model/tcp-tahoe.cc
index 73dd58fe7..59d6c282b 100644
--- a/src/internet/model/tcp-tahoe.cc
+++ b/src/internet/model/tcp-tahoe.cc
@@ -51,7 +51,7 @@ TcpTahoe::GetTypeId (void)
   return tid;
 }
 
-TcpTahoe::TcpTahoe (void) : m_initialCWnd (0)
+TcpTahoe::TcpTahoe (void) : m_initialCWnd (1), m_retxThresh (3)
 {
   NS_LOG_FUNCTION (this);
 }
@@ -60,7 +60,8 @@ TcpTahoe::TcpTahoe (const TcpTahoe& sock)
   : TcpSocketBase (sock),
     m_cWnd (sock.m_cWnd),
     m_ssThresh (sock.m_ssThresh),
-    m_initialCWnd (sock.m_initialCWnd)
+    m_initialCWnd (sock.m_initialCWnd),
+    m_retxThresh (sock.m_retxThresh)
 {
   NS_LOG_FUNCTION (this);
   NS_LOG_LOGIC ("Invoked the copy constructor");