diff --git a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/Setting/TextSetting.qml b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/Setting/TextSetting.qml
index 6c1c355..54a4e82 100644
--- a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/Setting/TextSetting.qml
+++ b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/Setting/TextSetting.qml
@@ -112,6 +112,9 @@ Item {
         verticalAlignment: TextInput.AlignVCenter
         horizontalAlignment: control.label == "" ? TextInput.AlignLeft : TextInput.AlignHCenter
         color: sysPalette.windowText
+        validator: RegExpValidator {
+            regExp: control.isInt ? /-?[0-9]+/ : control.isDouble ? /-?[0-9]+(\.[0-9]+)?/ : /.+/
+        }
         focus: true
         text: control.defValue
         selectByMouse: true