diff --git a/src/ethernet_interface.cpp b/src/ethernet_interface.cpp
index 504090f..bdae08f 100644
--- a/src/ethernet_interface.cpp
+++ b/src/ethernet_interface.cpp
@@ -509,7 +509,7 @@
     {
         deleteInterface(interface);
     }
-    catch (InternalFailure& e)
+    catch (const InternalFailure& e)
     {
         commit<InternalFailure>();
     }
@@ -812,7 +812,7 @@
         // network file.
         manager.restartSystemdUnit(networkdService);
     }
-    catch (InternalFailure& e)
+    catch (const InternalFailure& e)
     {
         log<level::ERR>("Exception processing DNS entries");
     }
@@ -1191,7 +1191,7 @@
     {
         newMAC = mac_address::fromString(value);
     }
-    catch (std::invalid_argument&)
+    catch (const std::invalid_argument&)
     {
         log<level::ERR>("MACAddress is not valid.",
                         entry("MAC=%s", value.c_str()));
diff --git a/src/network_manager.cpp b/src/network_manager.cpp
index 4ff8952..4ff9e17 100644
--- a/src/network_manager.cpp
+++ b/src/network_manager.cpp
@@ -95,7 +95,7 @@
             }
         }
     }
-    catch (std::exception& e)
+    catch (const std::exception& e)
     {
         log<level::ERR>("Unable to create the default network file");
     }
diff --git a/src/routing_table.cpp b/src/routing_table.cpp
index 68a9ee3..ab495eb 100644
--- a/src/routing_table.cpp
+++ b/src/routing_table.cpp
@@ -34,7 +34,7 @@
     {
         getRoutes();
     }
-    catch (InternalFailure& e)
+    catch (const InternalFailure& e)
     {
         commit<InternalFailure>();
     }
diff --git a/src/vlan_interface.cpp b/src/vlan_interface.cpp
index 035eb07..2918989 100644
--- a/src/vlan_interface.cpp
+++ b/src/vlan_interface.cpp
@@ -55,7 +55,7 @@
     {
         stream.open(confPath.c_str(), std::fstream::out);
     }
-    catch (std::ios_base::failure& e)
+    catch (const std::ios_base::failure& e)
     {
         log<level::ERR>("Unable to open the VLAN device file",
                         entry("FILE=%s", confPath.c_str()),