diff --git a/examples/network/network-chat/chatdialog.h b/examples/network/network-chat/chatdialog.h
index adda73fb726..45a98588223 100644
--- a/examples/network/network-chat/chatdialog.h
+++ b/examples/network/network-chat/chatdialog.h
@@ -12,7 +12,7 @@ class ChatDialog : public QDialog, private Ui::ChatDialog
     Q_OBJECT
 
 public:
-    ChatDialog(QWidget *parent = nullptr);
+    explicit ChatDialog(QWidget *parent = nullptr);
 
 public slots:
     void appendMessage(const QString &from, const QString &message);
diff --git a/examples/network/network-chat/connection.h b/examples/network/network-chat/connection.h
index ee9b00c1027..77c116cf6b5 100644
--- a/examples/network/network-chat/connection.h
+++ b/examples/network/network-chat/connection.h
@@ -32,8 +32,8 @@ public:
         Undefined
     };
 
-    Connection(QObject *parent = nullptr);
-    Connection(qintptr socketDescriptor, QObject *parent = nullptr);
+    explicit Connection(QObject *parent = nullptr);
+    explicit Connection(qintptr socketDescriptor, QObject *parent = nullptr);
     ~Connection();
 
     QString name() const;
diff --git a/examples/network/network-chat/peermanager.h b/examples/network/network-chat/peermanager.h
index d077e2c0e13..dadabd88aa2 100644
--- a/examples/network/network-chat/peermanager.h
+++ b/examples/network/network-chat/peermanager.h
@@ -18,7 +18,7 @@ class PeerManager : public QObject
     Q_OBJECT
 
 public:
-    PeerManager(Client *client);
+    explicit PeerManager(Client *client);
 
     void setServerPort(int port);
     QString userName() const;
diff --git a/examples/network/network-chat/server.h b/examples/network/network-chat/server.h
index f41ffebaefa..0557de30de2 100644
--- a/examples/network/network-chat/server.h
+++ b/examples/network/network-chat/server.h
@@ -13,7 +13,7 @@ class Server : public QTcpServer
     Q_OBJECT
 
 public:
-    Server(QObject *parent = nullptr);
+    explicit Server(QObject *parent = nullptr);
 
 signals:
     void newConnection(Connection *connection);