diff --git a/src/core/model/time.cc b/src/core/model/time.cc
index 32a0f9446..f89a95621 100644
--- a/src/core/model/time.cc
+++ b/src/core/model/time.cc
@@ -137,43 +137,43 @@ Time::Time(const std::string& s)
         double r;
         iss >> r;
         std::string trailer = s.substr(n, std::string::npos);
-        if (trailer == std::string("s"))
+        if (trailer == "s")
         {
             *this = Time::FromDouble(r, Time::S);
         }
-        else if (trailer == std::string("ms"))
+        else if (trailer == "ms")
         {
             *this = Time::FromDouble(r, Time::MS);
         }
-        else if (trailer == std::string("us"))
+        else if (trailer == "us")
         {
             *this = Time::FromDouble(r, Time::US);
         }
-        else if (trailer == std::string("ns"))
+        else if (trailer == "ns")
         {
             *this = Time::FromDouble(r, Time::NS);
         }
-        else if (trailer == std::string("ps"))
+        else if (trailer == "ps")
         {
             *this = Time::FromDouble(r, Time::PS);
         }
-        else if (trailer == std::string("fs"))
+        else if (trailer == "fs")
         {
             *this = Time::FromDouble(r, Time::FS);
         }
-        else if (trailer == std::string("min"))
+        else if (trailer == "min")
         {
             *this = Time::FromDouble(r, Time::MIN);
         }
-        else if (trailer == std::string("h"))
+        else if (trailer == "h")
         {
             *this = Time::FromDouble(r, Time::H);
         }
-        else if (trailer == std::string("d"))
+        else if (trailer == "d")
         {
             *this = Time::FromDouble(r, Time::D);
         }
-        else if (trailer == std::string("y"))
+        else if (trailer == "y")
         {
             *this = Time::FromDouble(r, Time::Y);
         }
diff --git a/src/dsr/model/dsr-rcache.cc b/src/dsr/model/dsr-rcache.cc
index 6f326156d..8e5487f44 100644
--- a/src/dsr/model/dsr-rcache.cc
+++ b/src/dsr/model/dsr-rcache.cc
@@ -308,11 +308,11 @@ void
 DsrRouteCache::SetCacheType(std::string type)
 {
     NS_LOG_FUNCTION(this << type);
-    if (type == std::string("LinkCache"))
+    if (type == "LinkCache")
     {
         m_isLinkCache = true;
     }
-    else if (type == std::string("PathCache"))
+    else if (type == "PathCache")
     {
         m_isLinkCache = false;
     }
diff --git a/src/netanim/model/animation-interface.cc b/src/netanim/model/animation-interface.cc
index f207812d2..08a601520 100644
--- a/src/netanim/model/animation-interface.cc
+++ b/src/netanim/model/animation-interface.cc
@@ -2007,7 +2007,7 @@ AnimationInterface::WriteLinkProperties()
             }
             NS_LOG_DEBUG("Got ChannelType" << channelType);
 
-            if (!ch || (channelType != std::string("ns3::PointToPointChannel")))
+            if (!ch || (channelType != "ns3::PointToPointChannel"))
             {
                 NS_LOG_DEBUG("No channel can't be a p2p device");
                 /*
@@ -2042,7 +2042,7 @@ AnimationInterface::WriteLinkProperties()
                 continue;
             }
 
-            else if (channelType == std::string("ns3::PointToPointChannel"))
+            else if (channelType == "ns3::PointToPointChannel")
             { // Since these are duplex links, we only need to dump
                 // if srcid < dstid
                 std::size_t nChDev = ch->GetNDevices();