diff --git a/plugins/ImageReader/ConfigUI.qml b/plugins/ImageReader/ConfigUI.qml
index 16b0827ae8..0d05135b08 100644
--- a/plugins/ImageReader/ConfigUI.qml
+++ b/plugins/ImageReader/ConfigUI.qml
@@ -45,7 +45,7 @@ UM.Dialog
             Layout.fillWidth: true
             selectByMouse: true
             objectName: "Peak_Height"
-//            validator: RegExpValidator { regExp: /^\d{0,3}([\,|\.]\d*)?$/ }
+            validator: RegExpValidator { regExp: /^\d{0,3}([\,|\.]\d*)?$/ }
             onTextChanged: manager.onPeakHeightChanged(text)
         }
 
@@ -76,7 +76,7 @@ UM.Dialog
             selectByMouse: true
             Layout.fillWidth: true
             objectName: "Base_Height"
-//            validator: RegExpValidator { regExp: /^\d{0,3}([\,|\.]\d*)?$/ }
+            validator: RegExpValidator { regExp: /^\d{0,3}([\,|\.]\d*)?$/ }
             onTextChanged: manager.onBaseHeightChanged(text)
         }
 
@@ -108,7 +108,7 @@ UM.Dialog
             objectName: "Width"
             Layout.fillWidth: true
             focus: true
-//            validator: RegExpValidator { regExp: /^[1-9]\d{0,2}([\,|\.]\d*)?$/ }
+            validator: RegExpValidator { regExp: /^[1-9]\d{0,2}([\,|\.]\d*)?$/ }
             onTextChanged: manager.onWidthChanged(text)
         }
 
@@ -140,7 +140,7 @@ UM.Dialog
             selectByMouse: true
             objectName: "Depth"
             focus: true
-//            validator: RegExpValidator { regExp: /^[1-9]\d{0,2}([\,|\.]\d*)?$/ }
+            validator: RegExpValidator { regExp: /^[1-9]\d{0,2}([\,|\.]\d*)?$/ }
             onTextChanged: manager.onDepthChanged(text)
         }
 
@@ -233,7 +233,7 @@ UM.Dialog
             Layout.fillWidth: true
             selectByMouse: true
             objectName: "Transmittance"
-//            validator: RegExpValidator { regExp: /^[1-9]\d{0,2}([\,|\.]\d*)?$/ }
+            validator: RegExpValidator { regExp: /^[1-9]\d{0,2}([\,|\.]\d*)?$/ }
             onTextChanged: manager.onTransmittanceChanged(text)
         }