diff --git a/src/addressbook.cpp b/src/addressbook.cpp
index cd9a490..85f9e56 100644
--- a/src/addressbook.cpp
+++ b/src/addressbook.cpp
@@ -98,6 +98,9 @@ void AddressBook::open(MainWindow* parent, QLineEdit* target) {
     ab.setupUi(&d);
     Settings::saveRestore(&d);
 
+    QRegExpValidator v(QRegExp(Settings::labelRegExp), ab.label);
+    ab.label->setValidator(&v);
+
     AddressBookModel model(ab.addresses);
     ab.addresses->setModel(&model);
 
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index d59634e..7c78be9 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -1045,6 +1045,10 @@ void MainWindow::setupRecieveTab() {
         }
     });
 
+    // Validator for label
+    QRegExpValidator* v = new QRegExpValidator(QRegExp(Settings::labelRegExp), ui->rcvLabel);
+    ui->rcvLabel->setValidator(v);
+
     // Select item in address list
     QObject::connect(ui->listRecieveAddresses, 
         QOverload<int>::of(&QComboBox::currentIndexChanged), [=] (int index) {
diff --git a/src/settings.cpp b/src/settings.cpp
index fdb464e..86b8f68 100644
--- a/src/settings.cpp
+++ b/src/settings.cpp
@@ -204,3 +204,4 @@ bool Settings::isValidAddress(QString addr) {
             ztsexp.exactMatch(addr) || zsexp.exactMatch(addr);
 }
 
+const QString Settings::labelRegExp("[a-zA-Z0-9\\-_]{0,40}");
diff --git a/src/settings.h b/src/settings.h
index fb18779..ee5318b 100644
--- a/src/settings.h
+++ b/src/settings.h
@@ -73,6 +73,8 @@ public:
     
     static bool    isValidAddress(QString addr);
 
+    static const QString labelRegExp;
+
     static const int     updateSpeed         = 20 * 1000;        // 20 sec
     static const int     quickUpdateSpeed    = 5  * 1000;        // 5 sec
     static const int     priceRefreshSpeed   = 60 * 60 * 1000;   // 1 hr