diff --git a/mupen64plus-input-qt/configdialog.cpp b/mupen64plus-input-qt/configdialog.cpp
index e00a00a..7950756 100644
--- a/mupen64plus-input-qt/configdialog.cpp
+++ b/mupen64plus-input-qt/configdialog.cpp
@@ -352,7 +352,11 @@ ProfileEditor::ProfileEditor(QString profile, QSettings *settings, QWidget *pare
 
     activeButton = nullptr;
     QString section = profile;
+    QRegExp rx("[a-zA-Z0-9]+");
+    QValidator *validator = new QRegExpValidator(rx, this);
     QLineEdit *profileName = new QLineEdit(this);
+    profileName->setValidator(validator);
+    profileName->setMaxLength(30);
     if (profile == "Auto-Keyboard" || profile == "Auto-Gamepad") {
         profileName->setDisabled(0);
         profile = "";